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
All are calculated by Coho study, except ? 
Select and explain. 
A. Incidence, B. Relative risk, C. Odds ratio, D. Attributable risk
C: Odds ratio
Answer: C: Odds ratio 
Explanation: Ans. is 'c' i.e., Odds ratio Characteristics Coho Study Case control Study Cross Sectional Study Design Prospective Retrospective One point in time Incidence Estimated Not estimated Not estimated Prevalence Not estimated Not estimated Estimated Calculations Incidence rates Relative risk Attributable risk Odds ratio