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
Commonest site of branchial cyst: September 2012 
Select and explain. 
A. Lower 1/3rd of sternomastoid on anterior border, B. Lower 1/3rd of sternomastoid on posterior border, C. Upper 1/3rd of sternomastoid on anterior border, D. Upper 1/3rd of sternomastoid on posterior border
C: Upper 1/3rd of sternomastoid on anterior border
Answer: C: Upper 1/3rd of sternomastoid on anterior border 
Explanation: Ans. C i.e. Upper 1/3rd of sternomastoid on anterior border Branchial cyst MC site: Upper pa of neck, Wall is made of: Lymphoid tissue