This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Berkesonian bias is a type of 
Select and explain. 
A. Selection bias, B. Interviewer bias, C. Information bias, D. Recall bias
A: Selection bias
Answer: A: Selection bias 
Explanation: A special example of bias is berkesonian bias termed after doctor Joseph berkeson who recognized this problem. The bias arises because of different rates of admission to hospitals for people with different diseases (refer pgn:74 park 23 rd edition )