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': 'All are true regarding sebaceous cyst except: \nSelect and explain. \nA. Is classified as an epidermoid cyst, B. Only occurs on the face and scalp, C. Can, if ulcerated, becomes a sebaceous horn, D. Characteristically displays a punctum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]