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
Limitation of case fatality rate- 
Select and explain. 
A. Not useful in acute infectious disease, B. Not related to virulence, C. Time period not specified, D. It is not related to survival rate
C: Time period not specified
Answer: C: Time period not specified 
Explanation: Limitations of case fatality rate is that time period is not specified.
CFR is typically used in acute infectious disease and is related to virulence of organism.
Case fatality rate is the complement of survival rate.