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
[{'content': 'Which of the following is not a swelling in midline: \nSelect and explain. \nA. Thyroglossal cyst., B. Sublingual dermoid., C. Branchial cyst., D. Submental lymph nodes enlargement.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The common swellings in the midline are:\n\nSubmental lymph nodes\nThyroid gland enlargement\nThyroglossal cyst\nSublingual dermoid\nLipoma\n\nCommon lateral swellings in the neck are:\n\nLymph node swelling\nSalivary gland enlargement\nThyroid enlargement\nBranchial cyst\nLipoma', 'role': 'assistant'}]