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
Case control study - estimate - 
Select and explain. 
A. Only odd's ratio, B. Odds ratio and attributable risk, C. Relative risk, attributable risk, population attributable risk, D. Incidence, Relative risk, and attributable risk
A: Only odd's ratio
Answer: A: Only odd's ratio 
Explanation: None