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
The association between disease & risk factor in a case control study is studied by - 
Select and explain. 
A. Relative role, B. Attributable role, C. Population attributable role, D. Odds ratio
D: Odds ratio
Answer: D: Odds ratio 
Explanation: None