This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neck, Subject name: Surgery
[{'content': 'This develops along lines of embryological fusion in the floor of the mouth. SELECT ONE. \nSelect and explain. \nA. Cholesteatoma, B. Dermoid cyst, C. Glomus tumor, D. Neurofibroma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dermoid cysts arise along line of fusion of embryonic parts. In the floor of the mouth, the swelling forces the tongue upward. Alternatively, the swelling may occur below the mylohyoid muscle, where it gives the impression of a double chin. It is not a premalignant lesion. It has an epithelial lining and may contain secretions, sloughed-off cells, and hair.', 'role': 'assistant'}]