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': 'All are used as emergency contraception except \nSelect and explain. \nA. Saheli, B. Combined OCPS, C. IUD, D. High dose estrogen for 5 days', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]