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: Social & Preventive Medicine
[{'content': 'Which of the following is not used as an emergency contraceptive? \nSelect and explain. \nA. Oral LNG, B. LNG- Intrauterine device, C. CuT-Intrauterine device, D. Oral Mifepristone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]