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: Medicine
Klebsiella pneumonia is 
Select and explain. 
A. Lobar pneumonia with absent air bronchogram sign, B. Involves lower lobe predominantly, C. Cavitation is common, D. Pleural effusion is not commonly seen
C: Cavitation is common
Answer: C: Cavitation is common 
Explanation: Klebsiella pneumonia :

Air bronchogram sign positive.
Involves upper lobe.
Cavitations and pleural effusion is common.