This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
Hypothyroidiam is caused by which of the following antitubercular drug 
Select and explain. 
A. Streptomycin, B. Ethionamide, C. Thioacetazone, D. Ethambutol
B: Ethionamide
Answer: B: Ethionamide 
Explanation: Refer KDT 6/e p743 PAS Ethionamide They can lead to hypothyroidiam