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
Case-control studies are used for - 
Select and explain. 
A. Study of common diseases, B. Finding multiple risk factors, C. Finding incidence rates, D. Finding relative risk
B: Finding multiple risk factors
Answer: B: Finding multiple risk factors 
Explanation: None