What measure of association should be calculated to determine the strength of the relationship between aspirin and colon cancer?

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A case-control study was conducted to evaluate the relationship between aspirin use and the risk of colon cancer. 2,000 cases and 2,000 controls were enrolled in the study. 1,800 of the cases reported using aspirin in the past while 1,200 of the controls reported using aspirin in the past. What measure of association should be calculated to determine the strength of the relationship between aspirin and colon cancer? a. Rate ratio b. Risk ratio c. Odds ratio d. Attributable risk