As stated in the DSM-5, the correct answer is "gender dysphoria involves feeling that your emotional and psychological identity as a certain gender is different than your biological sex." All of the other answer choices are false regarding gender dysphoria. 

"Chronic fatigue syndrome" is not an eating disorder; however, this syndrome is more commonly seen in individuals with poor nutritional habits (e.g. those with eating disorders). All of the other answer choices are categorized in the DSM-V as eating disorders. 

All of these symptoms—in addition to problems with motor coordination, social perception, and cognitive functions and other distinctive facial features—are associated with "fetal alcohol syndrome" (FAS). This results from the individual’s mother ingesting alcohol during pregnancy, leading to abnormalities in fetal development. Down syndrome, while associated with lower IQ, typically involves a higher level of cognitive functioning than FAS. Additionally, Down syndrome is related to three (instead of the normal two) copies of chromosome 21. Parkinson’s disease and Huntington’s disease are both more associated with abnormalities in motor function and muscular coordination; while some cognitive disturbances or slowing may occur, the IQ is not as drastically affected and the distinctive facial features listed have not been observed.

Randall's episodes are most likely a feature of a rare class of disorders called dissociative disorders. Dissociative disorders are a class of disorders in which people lose contact with portions of their consciousness or memory, resulting in disruptions in their sense of identity.

There are many aspects of speech that could indicate a person is a psychopath. A combination of psychological and linguistic research has pointed to several factors that indicate psychopathology. The excess use of causatives in sentences are indicative of a psychopath's need to create a logical justification for their acts. The use of the past tense instead of present indicates a psychological detachment from the world as if they are looking in instead of a participant. Psychological factors such as a lack of remorse or an obsession with basic needs also point to psychopathy. 

While borderline personality disorder (BPD) does not have the highest suicide rate of any psychological disorder, it has the highest of the personality class. Some reports estimate that up to 10% of diagnosed patients carry through with suicide. The exact number depends on the study, but BPD holds the highest rate under any account.

Exact known causes of Parkinson's disease are still unknown, but researchers are working towards a better understanding. On the other hand, a gene on chromosome 4 has been identified to cause Huntington's, and a thiamine deficiency has been identified to cause Wernicke-Korsakoff syndrome. These reductionist explanations suggest that Huntington's and Wernicke-Korsakoff syndrome are caused by singular processes, but it is probably much more complex.

Cognitive theorists believe that the mind and patterns of thinking are largely in control of how a person views and responds to life's events. Cognitive theorists believe that people with unipolar depression persistently view events and situations in life in negative ways. As a result of these defeatist perceptions, such people sink into feelings of gloom, helplessness, and depression.

Any traumatic event can trigger post-traumatic stress disorder. Some of the most likely to do so include combat, disasters, abuse of any kind, victimization, and torture.