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: Gynaecology & Obstetrics
The safest drug in pregnancy : 
Select and explain. 
A. INH, B. Rifampicin, C. Ethambutol, D. Streptomycin
A: INH
Answer: A: INH 
Explanation: INH