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: Unknown
[{'content': 'Light House sign is seen in: \nSelect and explain. \nA. Acute Suppurative Otitis media, B. Otosclerosis, C. Acute mastoiditis, D. Meniere’s disease', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Active pulsatile discharge seen on otoscopy showing intermittent reflection of light (comparable to Light House) in ASOM.', 'role': 'assistant'}]