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: ENT
[{'content': 'Which is the most pulsatile tumor found in external auditory meatus which bleeds on touch? \nSelect and explain. \nA. Squamous cell ca of pinna, B. Basal cell ca, C. Adenoma, D. Glomus tumor', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Glomus tumor is the neoplasm of middle ear, it may perforate the tympanic membrane and appears as a polypus in the external auditory meatus which bleeds profusely if touched.', 'role': 'assistant'}]