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
In a 3-year old child which of the following is the most common cyst located in midline of neck: 
Select and explain. 
A. Thyroglossal cyst, B. Branchial cyst, C. Lymphangiocele, D. Cystic hygroma
A: Thyroglossal cyst
Answer: A: Thyroglossal cyst 
Explanation: None