<prompt> Which among the following is TRUE about confounding factor?It is found equally between study and the control groupsIt is itself a risk factor for the diseaseConfounding can be eliminated by selecting a small groupIt is associated with either the exposure or the disease  <response>: A confounding factor is defined as one which is associated both with exposure and disease, and is distributed unequally in study and control groups. More specifically a confounding factor is one that, although associated with exposure under investigation, is itself, independently of any such association, a risk factor for the disease. Ref: Parks Textbook of Preventive and Social Medicine, 19th edition, Page 67. 