<prompt> In a study done to establish Smoking as a risk factor for a disease, 30 out of 50 smokers developed the disease while 10 out of 50 non-smokers developed the disease. Odds ratio is?36510  <response>: ANSWER: B 6REF: Park 20th edition page 69 SmokerNon smoker Disease301040Non disease204060 5050 Odds ratio 30 x 40 20 x 10 6 