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
True about confounding factor 
Select and explain. 
A. 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
A: It is found equally between study and the control groups
Answer: A: It is found equally between study and the control groups 
Explanation: .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