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
Isotretinoin to be stopped before pregnancy 
Select and explain. 
A. 3 days, B. 2 week, C. 3 month, D. 3 years
C: 3 month
Answer: C: 3 month 
Explanation: 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.