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 type of ectopic pregnancy with rupture is: \nSelect and explain. \nA. Isthmic, B. Ampulla, C. Interstitial, D. Intundibula', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Isthmic', 'role': 'assistant'}]