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
Incidence rate is measured by - 
Select and explain. 
A. Case control study, B. Coho study, C. Cross sectional study, D. Cross over study
B: Coho study
Answer: B: Coho study 
Explanation: Ans. is 'b' i.e., Coho study Coho study analyses the following data :?1) Incidence rate among exposed and nonexposed2) Estimation of riska) Relative risk (risk ratio)b) Attributable risk (risk difference)c) Population attributable riskIncidence rateo In coho study, incidence rate can be determined directly in those exposed and nonexposed.