This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Pharmacology
Pharmacodynamics deals with:- 
Select and explain. 
A. Mode of excretion of a drug, B. Mechanism of action of a drug, C. Transpo of drug across the biological membranes, D. Latency of onset
B: Mechanism of action of a drug
Answer: B: Mechanism of action of a drug 
Explanation: 2 main branches in pharmacology Pharmacodynamics Studies effect of drug on body, i.e. Action of drug. Mechanism of action Pharmacokinetics Studies effect of body on drug, i.e. Absorption Distribution Metabolism Excretion Option A , C , D is studied in pharmacokinetics of drugs.