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': 'Internal orifice of branchial Fistula is located at: \nSelect and explain. \nA. Lower third of neck over anterior border of starnocleidomastoid, B. Floor of external auditory canal, C. Posterior tonsillar pillar, D. Anterior to tragus on the ipsilateral side', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Branchial festula represents 2nd\xa0branchial cleft:\n\nInternal orifice: Anterior aspect of posterior tonsillar pillar.\nExternal orifice: Lower third of neck over anterior border of sternocleidomastoid.', 'role': 'assistant'}]