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
CURB-65' includes - 
Select and explain. 
A. PaO2 less than 65 mm, B. Coagulopathy, C. Severe Azotemia, D. Base deficit (acidosis)
C: Severe Azotemia
Answer: C: Severe Azotemia 
Explanation: None