<prompt> Bias is defind as?Spurious association between two variablesA quantified relationship between exposure and diseaseSystematic error in determination of association between exposure and diseaseStatistical technique used to evaluate the effect of a treatment by comparing treated and non treated  <response>: Bias is any systemic error in the determination of the association between exposure and diseases. The relative risk estimate may increase or decrease as a result of the bias. It reflects some type of no compatibility between the study and control groups. Ref: 25th edition, Parks Textbook of Preventive and Social Medicine, Page no. 81 