This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ectopic Pregnancy (Hello ! Where are you ?), Subject name: Gynaecology & Obstetrics
[{'content': 'Ectopic pregnancy is seen most commonly in: \nSelect and explain. \nA. Previous H/O recurrent PID, B. Previous H/O aboion, C. Previous H/O twin pregnancy, D. Endometriosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The most common cause of ectopic is Pelvic Inflammatory Diseases(PID).', 'role': 'assistant'}]