This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Select false statement regarding case fatality rate 
Select and explain. 
A. It is a killing power of disease, B. It is 'complement of survival rate', C. CFR is a propoion, D. Time interval is specified in CFR
D: Time interval is specified in CFR
Answer: D: Time interval is specified in CFR 
Explanation: CFR = 1 - Survival rate Time interval is not specified. Determines killing power of disease/ virulence of organism. CFR is a Propoion (Expressed always in %). CFR of Rabies 100%.