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: Anatomy
[{'content': 'Internal opening of brachial fistula is located at \nSelect and explain. \nA. Around 3rd molar, B. Around 2nd Premolar, C. Behind Palatoglossal Arch, D. Fossa of Tonsils', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]