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': 'Heamorrhagic external otitis media is caused by: \nSelect and explain. \nA. Influenza, B. Proteus, C. Staphylococcus, D. Streptococcus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hemorrhagic external otitis media: (Otitis externa hemorrhagia) is caused by influenza virus. Characterised by formation of haemorrhagic bullae on tympanic membrane. Clinical features: severe pain and blood stained discharge. Treatment: Analgesics + antibiotics.', 'role': 'assistant'}]