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 done for all of the following drugs Except 
Select and explain. 
A. Phenytoin, B. diclofenac, C. Tacrolimus, D. Cyclosporine
B: diclofenac
Answer: B: diclofenac 
Explanation: TDM is not done for most commonly used drugs or safe drugs like paracetamol, diclofenac done for antiepileptic drugs, immunosuppressants, anticancer drugs, lithium Phenytoin- antiepileptic, cyclosporin, tacrolimus- immunosuppressants in the options not done for antihypeensives and BP can be measured clinically and easily REF KD Tripathi 8th ed