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
True statement about case fatality rate is - 
Select and explain. 
A. It is ratio, B. It is a propotion, C. Numerator is always constant, D. Numerator and denominator are separate entities
B: It is a propotion
Answer: B: It is a propotion 
Explanation: Ref: Parks 23rd edition pg 58 it is a propoion. It represents killing power of a disease. It is simply the ratio of deaths to cases.