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: Pathology
[{'content': 'Mucocele are rarely seen in the: \nSelect and explain. \nA. Lower lip, B. Upper lip, C. Buccal mucosa, D. Floor of the mouth', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The mucous retention phenomenon is restricted almost entirely to\xa0the lower lip, seldom found on the upper lip, while accessory salivary gland neoplasms of the lips are almost universally found on the upper lip and only rarely on the lower lip.\xa0This could imply that trauma plays no role in the development of salivary gland tumours in this location.\nReference: Shafer’s Textbook of ORAL PATHOLOGY Eighth Edition page no 90', 'role': 'assistant'}]