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': 'Malignant otitis externa results from infection by which of the following organisms \nSelect and explain. \nA. Klebsiella, B. Enterococcus, C. Pseudomonas aeroginosa, D. Strep tococcal pneumonia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pseudomonas aeroginosa', 'role': 'assistant'}]