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': 'Which one of the following casues the greatest risk of ecotpic pregnancy : \nSelect and explain. \nA. Pelvic inf!amatory disease, B. IUD use, C. Previous ectopic pergnancy, D. Previous MTP', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c i.e. Previous ectopic pregnancy "Prior tuba/ damage, either from a previous ectopic pregnancy or from tuba! surgery to relieve infeility or for sterilization, confers the highest risk of ectopic pregnancy".', 'role': 'assistant'}]