This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other Key Definitions & Concepts, Subject name: Social & Preventive Medicine
Which of the following is a Good index of the "Severity of a sho-term, acute disease"? 
Select and explain. 
A. Cause-specific death rate, B. 5 years survival, C. Case fatality rate, D. Standardized moality ratio
C: Case fatality rate
Answer: C: Case fatality rate 
Explanation: Cause specific death rate No. of deaths from a specified cause per 100,000 person years at risk May be adjusted for the age & sex composition, or other characteristic of population 5 - years survival rate % of patients who are alive after treatment begins or 5 years after diagnosis =Index of success in cancer treatment =Yardstick for the assessment of standards of therapy Case fatality rate No. of people who die of a disease divided by no. of people who have disease For sho term, acute disease/conditions Standardized moality ratio observed no. of deaths divided by expected no. of deaths Aka indirect age adjustment