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 of the following is used to compare the death rates of two different populations - 
Select and explain. 
A. Crude death rate, B. Age specific death rate, C. Age standardized death rate, D. Proportional mortality rate
C: Age standardized death rate
Answer: C: Age standardized death rate 
Explanation: None