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
[{'content': 'Increased motivation by teacher have been found to increase marks of students in examination. This bias is called:- \nSelect and explain. \nA. Berksonian bias, B. Pygmalion bias, C. Hawthorne bias, D. Motivational bias', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pygmalion Bias - Increased Motivation by teacher have been found to increase marks of Student in Examination. This is type of "Investigatory Selection Bias". Hawthorne Bias - Study Subject change their behaviour during study , so outcome is changed. It is seen in Coho study. Berksonian Bias - Occurs due to different rates of Hospital Admission. This is type of Selection Investigation Bias. Golem bias - Demotivation by teachers can decrease marks of students.', 'role': 'assistant'}]