This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': "Not true about ectopic pregnancy: \nSelect and explain. \nA. Previous ectopic is greatest risk, B. Pregesterone only pills doesn't increase risk, C. Increased risk with pelvic infections, D. Increased risk with IVF", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Causes for ectopic pregnancy Pelvic inflammatory disease Congenital factors Salphingitis isthimica Previous surgery on the tube Assisted reproductive technology Intrauterine devices Cigarette smoking Previous ectopic (refer pgno:158 sheila 2 nd edition)', 'role': 'assistant'}]