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': 'Which is a causative organism for malignant ot externa \nSelect and explain. \nA. Virus, B. Bacteria, C. Fungi, D. Protozoa', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) BacteriaRef: Dhingra's ENT 5th ed. 157-58* Malignant otitis externa is caused by pseudomonas infection in elderly, diabetics & patients on the immune- compromised drugs .* Early manifestation resembles diffuse otitis externa. Patients have severe pain & appearance of granulation in meatus.Infectious Etiology of Ear CanalBacterialFungalViral* Localized otitis externa* Diffuse otitis externa* Malignant otitis externa* Otomycosis* Herpes zoster oticus* Otitis externa hemorrhagica", 'role': 'assistant'}]