This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Physiology
[{'content': 'Feilization most commonly takes place at \nSelect and explain. \nA. Infundibulum, B. Ampulla, C. Isthmus, D. Interstitium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]