This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
[{'content': 'Which of the following is bacteriostatic? \nSelect and explain. \nA. Isoniazid, B. Rifampicin, C. Ethambutol, D. Pyrazinamide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. EthambutolEthambutol is only first line antitubercular agent which is bacteriostatic. Rest all are bacteriocidal. Pyrazinamide is only drug which act on only intracellular bacteria. Rifampicin have the sterilizing effect. Isoniazid is given for prophylaxis of TB.', 'role': 'assistant'}]