This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Therapeutic drug monitoring is required for: March 2010 \nSelect and explain. \nA. Sulfonamides, B. Metformin, C. Cycloserine, D. Gentamycin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Gentamycin', 'role': 'assistant'}]