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 lasts longer in : \nSelect and explain. \nA. Interstitial, B. Isthumoampullary, C. Isthmic, D. Am pullary', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Interstitial', 'role': 'assistant'}]