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 not needed for? \nSelect and explain. \nA. Propanolol, B. Phenytoin, C. Piroxicam, D. Prazosin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Beta blockers - used for treating HTN drug response- change in BP can be measured easily - so no need for TDM or therapeutic monitoring Ref; KD Tripathi Pharmacology 7th edition (page no;56 )', 'role': 'assistant'}]