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': 'Ovarian pregnancy is due to: \nSelect and explain. \nA. Previous sexually transmitted infections, B. Feilisation of ovum in ovary, C. Bicornuate uterus, D. Pelvic tuberculosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Feilisation of ovum in ovary', 'role': 'assistant'}]