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
[{'content': 'The most effective antitubercular drug against slow multiplying intracellular mycobacteria ? \nSelect and explain. \nA. Rifampicin, B. Isoniazid, C. Pyrazinamide, D. Ethambutol', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Rifampicin o Isoniazid is bacteriostatic for resting bacilli, but is bactericidal for rapidly dividing microorganisms. -- G & G o The bactericidal action of rifampicin covers all subpopulations of TB bacilli.", 'role': 'assistant'}]