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': 'True about confounding factor \nSelect and explain. \nA. It is found equally between study and the control groups, B. It is itself a risk factor for the disease, C. Confounding can be eliminated by selecting a small group, D. It is associated with either the exposure or the disease', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .a "confounding factor"is defines as one which is associated both with exposure and disease and is distributed unequally in study and control groups.a cofounding factor by itself is a risk factor for the disease independently of any association. ref:park&;s textbook,ed22,pg no 63', 'role': 'assistant'}]