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': 'Antitubercular drug which is least hepatotoxic: September 2010 \nSelect and explain. \nA. Rifampicin, B. Pyrazinamide, C. Ethambutol, D. INH', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Ethambutol The single biggest problem with TB treatment is drug-induced hepatitis, which has a moality rate of around 5%. Three drugs can induce hepatitis: PZA, INH and RMP (in decreasing order of frequency). It is not possible to distinguish between these three causes based purely on signs and symptoms.', 'role': 'assistant'}]