A 50-year-old obese man with hyperlipidemia, hypertension, and type 2 diabetes mellitus comes to the physician for a routine examination During the visit he asks, “What is my risk of having a heart attack?” 

While searching your information database, which of the following represents the best study design to address his question?: (A) Case-control study, (B) Case series, (C) Cohort study, (D) Cross-sectional study
Answer is C. None