All of the following statements about growth hormone are true EXCEPT:

Correct Answer: D

Rationale: Step-by-step rationale for why choice D is correct: 1. Growth hormone stimulates the synthesis or release of somatomedins, supporting statement A. 2. Low levels of IGF-1 are associated with dwarfism, validating statement B. 3. Hypersecretion of growth hormone can lead to acromegaly, confirming statement C. 4. Choice D is incorrect because growth hormone is contraindicated in subjects with open epiphyses, not closed ones. This is because GH can stimulate bone growth, potentially causing issues in individuals with open growth plates.

Correct Answer: C

Rationale: The correct answer is C: Celecoxib. Celecoxib is a selective COX-2 inhibitor, meaning it primarily targets the COX-2 enzyme, reducing inflammation and pain without affecting the protective COX-1 enzyme. This selective action reduces the risk of gastrointestinal side effects associated with traditional NSAIDs that inhibit both COX-1 and COX-2. Piroxicam (A), Indomethacin (B), and Diclofenac (D) are non-selective NSAIDs that inhibit both COX-1 and COX-2, leading to a higher risk of gastrointestinal complications.

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.