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': 'In which pa of fallopian tube, ectopic pregnancy is commonest: March 2004 \nSelect and explain. \nA. Ampulla, B. Isthmus, C. Fimbria, D. Cornua', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Ampulla', 'role': 'assistant'}]