This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification, Coho Study, Subject name: Social & Preventive Medicine
Exposure to multiple outcomes can be studied in 
Select and explain. 
A. Coho study, B. Case control study, C. Cross sectional study, D. Ecological study
A: Coho study
Answer: A: Coho study 
Explanation: In Coho study, multiple outcomes can be studied together. In Case control study, multiple exposures can be studied together. COHO STUDY: Time consuming & expensive study Incidence & RR can be calculated No recall bias Ethical problems are present & is not useful for rare diseases Loss of follow-up can be seen - max allowable attrition rate is < 5% ; ideal retention rate >= 95% HAWTHORN BIAS - study subjects alter their behavior without notice ; can be seen.