This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tubal Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'Least common site of ectopic pregnancv? \nSelect and explain. \nA. Interstitial part, B. Isthmus, C. Ampulla, D. Fimbrial end', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Interstitial EndThe image shows a fallopian tube with ovary seen close to the fimbrial end of the tube. The chances of ectopic pregnancy is highest in ampulla(choice c), and least in interstitial part ( Choice a).', 'role': 'assistant'}]