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': 'A 20 years old girl was raped around 13th day of her cycle. The best possible emergency contraception to be offered would be : \nSelect and explain. \nA. Centchroman tablets, B. Cu-T inseion, C. Levonorgestrel tablets, D. Ethinylestradiol tablets', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c i.e. Levonorgestrel tablets Centchroman tablets are not used as emergency contraception. Cu-T cannot be used in nulliparous patients. LNG tablet is the answer of choice as it has : - Less failure rate No side effects Single dose therapy 0.75mg LNG is to be taken within 72 hours of unprotected intercourse and another 12 hours later. Levonorgestrel is the DOC for emergency contraception. Ethinyl estradiol tablets has high failure rate (3.2%).', 'role': 'assistant'}]