This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharmacodynamics, Subject name: Pharmacology
Therapeutic drug monitoring of plasma concentrations of antihypeensive drugs is not practiced because: 
Select and explain. 
A. Determination of plasma level of these drugs is quite tedious and long process, B. It is easier to measure the effect of these drugs, C. Antihypeensive effect do not increase linearly with the dose, D. All antihypeensive drugs are prodrugs
B: It is easier to measure the effect of these drugs
Answer: B: It is easier to measure the effect of these drugs 
Explanation: * TDM is done for drugs (with narrow therapeutic index) whose response cannot be monitored by simple laboratory parameters. * Antihypeensive effect can be easily measured, therefore TDM is not required.