A study to evaluate the relationship of caffeine consumption and gastric cancer is conducted. Patients with gastric cancer are enrolled in the study, and researchers seek to match each patient with an...

A study to evaluate the relationship of caffeine consumption and gastric cancer is conducted. Patients with gastric cancer are enrolled in the study, and researchers seek to match each patient with an individual similar to him or her in as many ways as possible, except that the control subject does not have a diagnosis of gastric cancer. Both case and control subjects are then surveyed to examine possible exposures, including caffeine exposure. Of 500 patients, 250 are cases and an equal number are controls. Of cases, 150 met the minimum caffeine consumption limit set by the study, whereas only 50 controls did. What is the odds ratio defining the relationship of exposure and disease in this study?

(A) 1/6

(B) 0.375

(C) 1.7

(D) 2.7

(E) 3

(F) 6