Astudy was undertaken to test the hypothesis that chewing tobacco increases the risk of stomach cancer. detailed historical data on chewing tobacco use were collected from 400 subjects with newly diagnosed stomach cancer and 400 subjects without stomach cancer. the results revealed that chewing tobacco was not a significant risk factor for stomach cancer. a. descriptive studyb. ecological studyc. cross-sectional study d. case-control study e. retrospective cohort study

D. Case-Control Study

Explanation:

Case-Control Study: This study is also referred to as a case-referent study. The case-control study is one of the types of observational study that compares two different groups that vary in the outcome are compared and identified based on some causal attribute. It determines the process of exposure-related or associated with a particular outcome, for example, disease. In a case-control study, the cases and the controls are being identified and compared retrospectively.

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answer; education;