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: Physiology
[{'content': 'Which is the most common site of feilization in the female reproductive tract? \nSelect and explain. \nA. Cervix, B. Ampulla, C. Fimbriae, D. Uterus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The middle segment of fallopian tube called the ampulla is the widest and longest segment. It contains extensive branched mucosal folds and is the commonest site of feilization.', 'role': 'assistant'}]