Which of the following study designs provides the strongest evidence for estimating the incidence of a rare disease with a long latency period and minimal bias?

• A Retrospective case-control study
• B Prevalence survey (cross-sectional study)
• C Prospective cohort study ✓
• D Historical cohort study

Explanation

A prospective cohort study follows disease-free individuals from exposure forward in time, allowing direct measurement of incidence rates and minimizing recall and selection bias. For rare diseases with long latency, it is logistically demanding but yields the best quality incidence data. A historical cohort can be faster but relies on existing records that may be incomplete; case-control studies can estimate risk but not incidence directly.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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