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
Internal orifice of branchial Fistula is located at: 
Select and explain. 
A. 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
C: Posterior tonsillar pillar
Answer: C: Posterior tonsillar pillar 
Explanation: Branchial festula represents 2nd branchial cleft:

Internal orifice: Anterior aspect of posterior tonsillar pillar.
External orifice: Lower third of neck over anterior border of sternocleidomastoid.