<prompt> Population attributable risk is defined as:-Incidence of disease among exposed is so many times higher as compared to that among non-exposedSo much disease can be attributed to exposureIf risk factor is modified or eliminated, there will be so much annual reduction in incidence of disease in the given populationNone of the above  <response>: Population Attributable Risk PAR It is the incidence of disease or death in total population minus incidence of disease or death among those who were not exposed to suspected causal factor. It is useful as it provides an estimation of amount by which incidence of disease could be reduced in that population if the suspected factor was eliminated or modified. PAR is useful for National health programmes and policies. 