This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Which of the following anti-thyroid drugs are safe in pregnancy \nSelect and explain. \nA. Carbimazole, B. Iodine, C. Propylthiouracil, D. Methimazole', 'role': 'user'}, {'content': 'Answer: C \nExplanation: PTU is safe after 1st trimester of pregnancy for hypehyroidism In 1st trimester -it causes liver damage in the fetus liver will develop by the end of 1st trimester so PTU can be given from 2nd trimester', 'role': 'assistant'}]