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
A cystic, painless swelling along the upper border of sternocleidomastoid muscle is most likely to be: March 2013 (b) 
Select and explain. 
A. Thyroglossal cyst, B. Branchial cyst, C. Cystic hygroma, D. Branchial fistula
B: Branchial cyst
Answer: B: Branchial cyst 
Explanation: Ans. B i.e. Branchial cyst