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
True about cystic hygroma - 
Select and explain. 
A. Congenital sequestration of lymphatics, B. Resolves spontaneouly by 5 year of age, C. Common in upper 1/3rd of lateral neck, D. All
A: Congenital sequestration of lymphatics
Answer: A: Congenital sequestration of lymphatics 
Explanation: Answer is 'a' i.e. Congenital sequestration of lymphatics "Bailey writes that spontaneous regression may occur in cystic hygroma but I am not sure whether it occurs by 5 yrs of age".