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: Surgery
[{'content': 'The most common site of the internal opening of a bronchial fistula is at the - \nSelect and explain. \nA. Lateral nasopharyngeal wall, B. Fossa of Rosenmuller, C. Gingivo - labial sulcus, D. Tonsillar fossa', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]