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
Least hepatotoxic anti TB drug is : 
Select and explain. 
A. Ethambutol, B. Rifampicin, C. Pyrazinamide, D. Isoniazid
A: Ethambutol
Answer: A: Ethambutol 
Explanation: None