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
[{'content': 'Hypothyroidiam is caused by which of the following antitubercular drug \nSelect and explain. \nA. Streptomycin, B. Ethionamide, C. Thioacetazone, D. Ethambutol', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Refer KDT 6/e p743 PAS Ethionamide They can lead to hypothyroidiam', 'role': 'assistant'}]