This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNB 2018, Subject name: Social & Preventive Medicine
Bias in Which variation occur due to different disease treated in different hospitals:- 
Select and explain. 
A. Neyman bias, B. Berksonian bias, C. Attention bias, D. Recall bias
B: Berksonian bias
Answer: B: Berksonian bias 
Explanation: Berkesonian bias is a special type of bias, named after Dr. Joseph Berkeson, who recognized this problem due to different rates of admission to hospitals for people with different diseases Neyman bias: due to missing of fatal cases, mild/silent cases and cases of sho duration from the study. Attention bias or Hawthorne effect: study subjects may systematically alter their behavior when they know they are being observed. Recall bias: cases are more likely to remember exposure more correctly than controls.