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
All of the following statements regarding case control and coho studies are true, Except - 
Select and explain. 
A. Cohos are chosen based on history of `Exposure', B. Coho studies require longer time frame than case control studies, C. Coho studies are suitable to investigate 'rare' disease, D. Coho studies yield information about more than one disease
C: Coho studies are suitable to investigate 'rare' disease
Answer: C: Coho studies are suitable to investigate 'rare' disease 
Explanation: Ans. is 'c' i.e., Coho studies are suitable to investigate 'rare' disease o Coho studies are inappropriate when the disease or exposure under investigation is rare.