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': 'Which of the following antitubercular drugs is associated with hypothyroidism? \nSelect and explain. \nA. Rifampicin, B. Pyrazinamide, C. Ethionamide, D. Streptomycin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ethionamide is structurally similar to methimazole that has been shown to inhibit thyroid hormone synthesis hence causing hypothyroidism', 'role': 'assistant'}]