This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drugs in Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'Isotretinoin to be stopped before pregnancy \nSelect and explain. \nA. 3 days, B. 2 week, C. 3 month, D. 3 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Isotretinoin iseffective for treating severe acne but it is is category X drug in pregnancy. It is recommended that a woman should wait at least 1 month after stopping Isotretinoin before trying to became pregnant but the desirable time is 3 months.', 'role': 'assistant'}]