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
Malignant otitis externa results from infection by which of the following organisms 
Select and explain. 
A. Klebsiella, B. Enterococcus, C. Pseudomonas aeroginosa, D. Strep tococcal pneumonia
C: Pseudomonas aeroginosa
Answer: C: Pseudomonas aeroginosa 
Explanation: Pseudomonas aeroginosa