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': 'A study revealed that in study group, intake of carotene | ca colon but it is due to | fibre intake, This is due to \nSelect and explain. \nA. Sampling error, B. Eastogical factor, C. Misclassification bias, D. Confounding factor', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A "confounding factor" is defined as one which is associated both with exposure and disease, and is distributed unequally in study and control groups. More specifically a "confounding factor" is one that, although associated with "exposure" under investigation, is Itself, independently of any such association, a "risk factor" for the disease. Ref : Park 23rd edition Pgno : 72', 'role': 'assistant'}]