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
Which of the following is not a swelling in midline: 
Select and explain. 
A. Thyroglossal cyst., B. Sublingual dermoid., C. Branchial cyst., D. Submental lymph nodes enlargement.
C: Branchial cyst.
Answer: C: Branchial cyst. 
Explanation: The common swellings in the midline are:

Submental lymph nodes
Thyroid gland enlargement
Thyroglossal cyst
Sublingual dermoid
Lipoma

Common lateral swellings in the neck are:

Lymph node swelling
Salivary gland enlargement
Thyroid enlargement
Branchial cyst
Lipoma