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': 'Most common site of Implantation of tubal pregnancy is : \nSelect and explain. \nA. Interstitial poion of fallopian tube, B. Isthmus, C. Ampulla, D. Infundibulum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ampulla', 'role': 'assistant'}]