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
Framingham hea study is? 
Select and explain. 
A. Case-control study, B. Coho study, C. Cross-sectional study, D. None
B: Coho study
Answer: B: Coho study 
Explanation: Ans. is b i.e., Coho study Example of coho sutdies 1) Framingham hea study is a classical example of coho sutdy. 2) Smoking and lung cancer study. 3) Oral contraceptives and health study.