(Answered) A study of cancer was conducted among 10000 men in the

Economics

A study of cancer was conducted among 10,000 men in the United States who were 40-75 years of age. Every two years questionnaires are sent to these individuals, and newly diagnosed cases of various cancers were reported. The investigators in this study were particularly interested in the relationship between physical activity and prostate cancer. Out of 5,000 physically active men, 500 had prostate cancer. 1,000 physically inactive men had prostate cancer.

What is the study design?

A. Retrospective Cohort Study

B. Prospective Cohort Study

C. Ecological Study

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