Researchers Are Studying the Relationship Between Essential Hypertension and a Common

Researchers are studying the relationship between essential hypertension and a common mutation in the structure of a sodium channel protein.  A study population is randomly selected and blood samples are obtained for leukocyte genotyping.  The prevalence of hypertension is determined based on mean blood pressure measurements obtained using standardized ambulatory blood pressure monitoring conducted over 1 week.  Based on the analysis results, the researchers conclude that the sodium channel structure mutation is associated with hypertension.  Which of the following best describes the study design used by the investigators?

A) Case-control study
B) Cross-sectional study
C) Prospective cohort study
D) Randomized clinical trial
E) Retrospective cohort study

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