Which of the following is not a swelling in midline:: (A) Thyroglossal cyst., (B) Sublingual dermoid., (C) Branchial cyst., (D) Submental lymph nodes enlargement.
Answer is C. 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