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: Social & Preventive Medicine
[{'content': 'True about confounding factor- \nSelect and explain. \nA. It is found equally between study and control, 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', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., It is itself a risk factor for the disease Confounding factor has following characteristics i) Associated with the both exposure and the disease ii) Distributed unequally in study and control groups iii) Itself is a risk factor for the disease.", 'role': 'assistant'}]