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': 'Malignant otitis externa is caused by \nSelect and explain. \nA. Hemophilus influenzae, B. Pseudomonas aeroginosa, C. Streptococcus pyogenes, D. E. coli', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Malignant otitis externa is often caused by difficult to treat bacteria such as Pseudomonas aeruginosa. Only are cases of malignant otitis externa due to S.aureus, Proteus mirabilis and Aspergillus fumigates have been repoed.Ref: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 55', 'role': 'assistant'}]