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
Cystic compressible, translucent swelling in the posterior triangle of neck - 
Select and explain. 
A. Cystic hygroma, B. Branchial cyst, C. Thyroglossal cyst, D. Dermoid cyst
A: Cystic hygroma
Answer: A: Cystic hygroma 
Explanation: Ans. is 'a' i.e., Cystic hygroma