This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Advantage of case control over coho study 
Select and explain. 
A. Attributable risk can be calculated, B. Odds ratio can be calculated, C. For rare disease, D. Bias is minimum
B: Odds ratio can be calculated
Answer: B: Odds ratio can be calculated 
Explanation: Case-control study yields only estimate of relative risk Coho study yields incidence rates, relative risks as well as attributable risk (refer pgno:79 park 23 rd edition)