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
Therapeutic drug monitoring is not needed for? 
Select and explain. 
A. Propanolol, B. Phenytoin, C. Piroxicam, D. Prazosin
A: Propanolol
Answer: A: Propanolol 
Explanation: 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 )