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
First line of antitubercular drug is: 
Select and explain. 
A. Streptomycin, B. INH, C. Ethambutol, D. Cephalosporins
B: INH
Answer: B: INH 
Explanation: None