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
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: Coho study is also known as incidence study Features of coho study: Coho identified prior to the disease under investigation Study group so defined are observed over a period of time to determine the frequency of disease among them Study proceeds forward from cause to effect (pg no : 75 park 23 rd edition)