This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Dose of levonorgestrol for contraception is 
Select and explain. 
A. 0.75 mg single dose, B. 1.5 mg single dose, C. 1.5 mg double dose, D. 7.5 mg single dose
B: 1.5 mg single dose
Answer: B: 1.5 mg single dose 
Explanation: Levonorgestrol should be given as 0.75 mg 2 doses 12 hours apart or 1.5 mg single dose within 72 hours of unprotected sexual intercourse.