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': 'Blue ear drum is seen in ? \nSelect and explain. \nA. Serous otitis media, B. CSOM, C. Perforation, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Serous otitis media Any accumulation of fluid behind tympanic membrane causes structural changes in tympanic membrane causing it to appear blue, be it pus, blood or serous fluid. The most common cause of fluid accumulation in middle ear is serous otitis media or glue ear (most common cause) and haemotympanum. Other causes of blue tympanic membrane are glomus tumor, hemangioma of middle ear, and cholesterol granuloma.", 'role': 'assistant'}]