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
Which of the following anti-thyroid drugs are safe in pregnancy 
Select and explain. 
A. Carbimazole, B. Iodine, C. Propylthiouracil, D. Methimazole
C: Propylthiouracil
Answer: C: Propylthiouracil 
Explanation: 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