This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mycobacterial Diseases (TB, Leprosy and MAC), Subject name: Pharmacology
Best anti-tubercular drug against intermittently dividing mycobacteria is:- 
Select and explain. 
A. Rifampicin, B. Pyrazinamide, C. Ethambutol, D. INH
A: Rifampicin
Answer: A: Rifampicin 
Explanation: Bacteria Present at Most effective drug Rapidly multiplying Wall of tubercular cavity Isoniazid Intermittently dividing (Spuers) In casseous necrosis Rifampicin Slow multiplying Inside the macrophages Pyrazinamide