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: Gynaecology & Obstetrics
[{'content': "The 'morning after pill' contains which of the following? \nSelect and explain. \nA. Estradiol, B. Levonorgestrel, C. Estrone, D. PGE", 'role': 'user'}, {'content': "Answer: B \nExplanation: Emergency contraceptive pills (ECPs) are also known as 'the morning after pill', 'interception', 'postcoital contraception' or 'vacation pill', contains levonorgesterol (LNG). Levonorgesterol 0.75 mg in two doses 12 hours apa is specifically developed for emergency contraception. Levonorgesterol is the preferred method over Yuzpe regimen due to its higher efficacy and lesser side effects. Ref: Current Obstetrics & Gynecology By Gita Ganguly Mukherjee, Sudip Chakravay, Bhaskar Pal, et al, Jaypee Brothers, Medical Publishers, 2007, Page 366 ; Shaw, 13th ed, Page 233", 'role': 'assistant'}]