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': 'Commonest site of ectopic pregnancy is : \nSelect and explain. \nA. Uterus, B. Cervix -WE, C. Abdomen, D. Tubes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Tubes', 'role': 'assistant'}]