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': 'Ectopic pregnancy is most common 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: Previous h/o recurrent PID', 'role': 'assistant'}]