This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy: General Principles, Subject name: Pharmacology
Drug that crosses placenta is: 
Select and explain. 
A. Isoniazid, B. Rifampicin, C. Pyrazinamide, D. All
D: All
Answer: D: All 
Explanation: Ans. (D) All(Ref: KDT 18th/e p818-819)All first line antitubercular drugs can cross placenta. Streptomycin is contraindicated in preganancy whereas other drugs are found to be safe.