Tetany is a complication due to hypocalcemia which can occur if the parathyroid glands which control calcium balance are accidentaly injured during thyroidectomy. Tetany is associated with nerve excitability and sustained muscle contractions, or spasms. Tetanus, bone pain, and oliguria are not associated with complications of a thyroidectomy. Goiter is a manifestation of an overactive thyroid. 

Corticosteroids may lead to bone loss, especially after long term treatment (over 3 months). Calcium and vitamin D supplementation can help prevent these side effects. The client should also be advised to start a low impact exercise regimine if possible, and if necessary take a bisphosphonate drug. 

The correct answer is prednisone. Of all the medications listed, prednisone is the only medication that is known to cause hyperglycemia. 

Prednisone has a number of side effects including hyperglycemia, acne, headache, restlessness, insomnia, nausea, vomiting, and weight gain, among others. 

Clindamycin's side effects include diarrhea (including Clostridium difficile), and less commonly nausea, vomiting, and abdominal pain, among others, but not hyperglycemia.

Ketorolac's side effects include renal toxicity, tinnitus, heartburn, diarrhea, and abdominal pain, among others, but not hyperglycemia.

Lisinopril's side effects include hypotension, lightheadedness, angioedema, and barky cough, among others, but not hyperglycemia.

Simvastatin's side effects include muscle pains/aches, muscle weakness, and less frequently confusion, and electrolyte disturbances, but not hyperglycemia.

The correct answer is "to prevent lactic acidosis while hospitalized." This is the correct answer because a known side effect of metformin use is development of lactic acidosis (a form of metabolic acidosis). Patients who are hospitalized, especially if hospitalized for infections, like pneumonia, are independently at an elevated risk of developing a lactic acidosis. As such, to minimize the risk of lactic acidosis, a modifiable risk factor, metformin use, is frequently temporarily discontinued while inpatient. Patients on metformin are frequently switched to sliding-scale insulin as inpatients, as this allows for adequate glycemic monitoring, titration, and control. Once they are stable for discharge and the cause of their hospitalization is addressed and treated, most can be safely discharged home on metformin without issue.

While numerous measures are carried out while patients are hospitalized to prevent myocardial infarction, stroke, headache, and depression, the switching of metformin to sliding-scale insulin is not performed specifically for any of those reasons.

Type I diabetes is an autoimmune process that typically presents in young children in the form of DKA (diabetic ketoacidosis). This potentially life threatening condition is treated with IV insulin. Type II diabetes is insulin resistance, and is found in older adults (typically those who are overweight).