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
True about confounding factor- 
Select and explain. 
A. 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
B: It is itself a risk factor for the disease
Answer: B: It is itself a risk factor for the disease 
Explanation: 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.