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: Dental
[{'content': 'Confounding Factor is: \nSelect and explain. \nA. Itself a risk factor for the disease., B. Associated with both exposure and disease., C. Is distributed unequally in study and control group., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Confounding factor:\n\nOne which is associated with BOTH exposure and disease and is distributed UNEQUALLY in study and control group.\nIt is itself a RISK FACTOR for the disease. \ne.g. – study of coffee drinking and lung cancer – if coffee drinker is also a cigarette smoker then this cigarette smoking is a confounding factor. Confounding factor can be neutralized by MATCHING', 'role': 'assistant'}]