Which of the following statements is FALSE?

Correct Answer: D

Rationale: The correct answer is D because the statement that the half-life of glucagon is between 6 and 8 hours is FALSE. Glucagon's half-life is actually very short, around 5-10 minutes. This is due to rapid degradation by enzymes in the liver and kidneys. Glucagon is not stable in the bloodstream for long periods. A: Statement A is true as glucagon is indeed synthesized in the A cells of the pancreatic islets of Langerhans. B: Statement B is true as glucagon is a peptide consisting of a single chain of 29 amino acids, which is conserved across mammals. C: Statement C is true as glucagon is extensively degraded in the liver, kidneys, plasma, and at tissue receptor sites.

Correct Answer: B

Rationale: The correct answer is B: Cyclosporine. Cyclosporine is an immunosuppressant medication used to prevent organ rejection after transplantation. It is not considered a cytotoxic agent because it does not directly target and kill rapidly dividing cells. Azathioprine, Leflunomide, and Cyclophosphamide are cytotoxic agents commonly used in chemotherapy to kill rapidly dividing cells, making them incorrect choices.

Correct Answer: A

Rationale: The correct answer is A: Vitamin C. Mega doses of Vitamin C can be beneficial for viral respiratory infections due to its antioxidant properties and ability to support the immune system. Vitamin A is important for immune function but is not specifically known for its effectiveness against viral infections. Vitamin K is involved in blood clotting and bone health, not directly related to viral respiratory infections. Vitamin PP refers to Vitamin B3 (niacin), which plays a role in energy production and skin health, but is not typically associated with combating viral infections. In summary, Vitamin C is the most suitable choice for supporting the immune response against viral respiratory infections.

Correct Answer: A

Rationale: The correct answer is A because cholesterol synthesis inhibitors can potentially cause liver and muscle toxicity. Monitoring liver enzymes like ALT and AST can help detect liver damage, while monitoring muscle enzymes like CK can help detect muscle damage. Choice B is incorrect because monitoring these enzymes is necessary. Choice C is incorrect because not all enzymes need to be monitored. Choice D is incorrect because monitoring is necessary for specific enzymes.

Correct Answer: A

Rationale: Rationale: 1. 1,25-dihydroxyvitamin D3 is the active form of vitamin D and is used in cases of vitamin D resistance. 2. Vitamin D resistance results in impaired calcium absorption and metabolism. 3. Administering calcitriol helps bypass the resistance and maintain calcium levels. 4. Elevated skeletal turnover, hypercalcemia of malignancy, and hypophosphatemia are not direct indications for calcitriol administration.