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: Dental
Which of the following is a better indicator of the severity of an acute disease: 
Select and explain. 
A. Cause specific death rate., B. Case fatality rate., C. Standardized mortality ratio., D. Five year survival rate.
B: Case fatality rate.
Answer: B: Case fatality rate. 
Explanation: None