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: Social & Preventive Medicine
The case fatality rate is- 
Select and explain. 
A. Severity of disease, B. Communicability of disease, C. Burden of disease, D. None
A: Severity of disease
Answer: A: Severity of disease 
Explanation: Case fatality rate (ratio)

CFR represents the killing power (severity) of a disease.