This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Pharmacology, Subject name: Pharmacology
[{'content': 'Therapeutic drug monitoring is done for all drugs except: \nSelect and explain. \nA. Warfarin, B. Phenytoin, C. Gentamicin, D. Cycloserine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. CycloserineTherapeutic drug monitoring is process of measuring the plasma concentration for all the drugs which have narrow therapeutic index. Drugs like lithium, warfarin, phenytoin, theophylline, gentamicin undergo TDM as sub therapeutic level is not effective and higher dose causes toxicity.', 'role': 'assistant'}]