This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Pharmacology
[{'content': 'Which of the following drug can result in teratogenic effect shown in the diagram if given during pregnancy? \nSelect and explain. \nA. Niacin, B. Retinoic acid, C. Thiamine, D. Folic acid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (B) Retinoic acid(Ref: Katzung 13th/e p1042; KDT 8th/e p154)Retinoic acid and isotretinoin are well known teratogens. These can result in cleft lip and other congenital anomalies.', 'role': 'assistant'}]