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
Hepatotoxic drug used in tuberculosis is ? 
Select and explain. 
A. Isoniazid, B. Streptomycin, C. Kanamycin, D. Ethambutol
A: Isoniazid
Answer: A: Isoniazid 
Explanation: Ans. is 'a' i.e., Isoniazid