This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following is most active against both dormant & non-dormant bacilli - 
Select and explain. 
A. Pyrazinamide, B. Rifampicin, C. Streptomycin, D. INH
B: Rifampicin
Answer: B: Rifampicin 
Explanation: Ans. is 'b' i.e., Rifampin Isoniazid is bacteriostatic for resting bacilli, but is bactericidal for rapidly dividing microorganisms. o The bactericidal action of rifampicin covers all subpopulations of TB bacilli.