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
Severity of disease is assessed by: 
Select and explain. 
A. Secondary attack rate, B. Case fatality rate, C. Prevalence rate, D. Incidence rate
B: Case fatality rate
Answer: B: Case fatality rate 
Explanation: Ans. is 'b' i.e. Case fatality rate Case fatality rate represents the killing power of the disease. It is closely related to virulence of the disease.