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
Which among the following is used as yardstick for the assessment of standards of therapy 
Select and explain. 
A. Proportional mortality rate, B. Survival rate, C. Case fatality rate, D. Crude death rate
B: Survival rate
Answer: B: Survival rate 
Explanation: None