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': 'Factor which is associated both with exposure and disease is called - \nSelect and explain. \nA. Confounding factor, B. Risk factor, C. Proximal risk factor, D. Case', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Confounding factor", 'role': 'assistant'}]