This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: D.O.C, Subject name: Pharmacology
Drug of choice for prophylaxis of TB is?(DNB 2012-section-1) 
Select and explain. 
A. Rifampicin, B. Isoniazid, C. Pyrizinamide, D. Streptomycin
B: Isoniazid
Answer: B: Isoniazid 
Explanation: Ans. (b) IsoniazidRef .KDT 6/e / 740-743