This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Hemorrhagic external otitis media is caused by? \nSelect and explain. \nA. Influenza, B. Proteus, C. Staphylococcus, D. Klebsiella', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is characterised by the formation of hemorrhagic bullae on the tympanic membrane and deep meatus. It is probably viral in origin and seen in influenza epidemics. (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 55)', 'role': 'assistant'}]