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': 'When an association between two variable is explained by a third variable due to indirect association. It is called as? \nSelect and explain. \nA. Cognitive bias, B. Confounding bias, C. Berkessonian bias, D. Indirect bias', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .confounding bias is used as a third variable to explain the association between two variables caused due to indirect association ref:park&;s textbook of preventive and social medicine,22nd edition,pg no 71', 'role': 'assistant'}]