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
Study suitable for rare diseases ? 
Select and explain. 
A. Coho study, B. Case-control study, C. Both of the above, D. None of the above
B: Case-control study
Answer: B: Case-control study 
Explanation: Ans. is 'b' i.e., Case-control study