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
Problem of bias is maximum with - 
Select and explain. 
A. Coho study, B. Case study, C. Case control study, D. Experimental study
C: Case control study
Answer: C: Case control study 
Explanation: Ans. is 'c' i.e., Case control study