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
All are true about cystic hygroma, except 
Select and explain. 
A. Pulsatile, B. May cause respiratory obstruction, C. Common in neck, D. Present in birth
A: Pulsatile
Answer: A: Pulsatile 
Explanation: None