Question: A study is designed to assess the relationship between a rare disease (disease A) and an exposure of interest (exposure A). One-hundred subjects with disease

A study is designed to assess the relationship between a rare disease ("disease A") and an exposure of interest ("exposure A"). One-hundred subjects with "disease A" are recruited to participate in the study, as are 200 subjects who do not have "disease A". This is an example of what kind of study design?

Randomized prospective cohort study

Cross-sectional study

Observational prospective cohort study

Case-control study

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