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: Pharmacology
[{'content': 'Antithyroid drug contraindicated in pregnancy ? \nSelect and explain. \nA. Propylthiouracil, B. 1131, C. Methimazole, D. Carbimazole', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is'b'i.e., I 131lRef: KDT 7tu/e p. 25Antithyroid treatment contraindicated in pregnancyThyroidectomy and I 131 are contraindicated during pregnancy.", 'role': 'assistant'}]