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: Radiology
Most important cause of bulging fissure 
Select and explain. 
A. Klebsiella pneumonia, B. Legionella pneumonia, C. Mycobacterium tuberculosis, D. Staph aureus
A: Klebsiella pneumonia
Answer: A: Klebsiella pneumonia 
Explanation: All the above are causes of bulging fissure.
Most important cause is Klebsiella pneumonia.