<prompt> Smoking is the cause of 85 of lung cancers that occurred within a group of smokers. This is an example of which of the following statistics?Population attributable risk.Odds ratioAttributable riskRelative risk  <response>: According to the question, 85 of the lung cancers that occur among smokers is due to their smoking. Thus there is a attributable risk of 85 for smokers to develop lung cancers. It implies that by controlling the factor, the disease can be eliminated. Attributable Risk is the difference in incidence rates of a disease between an exposed group and non-exposed group and it is often expressed as a percentage. Ref: Parks Textbook of Preventive and Social Medicine, 19th Edition; Pages 68 and 73. 