Which statement correctly distinguishes incidence from prevalence?

• A. Incidence is the rate of new cases over a period; prevalence is the total number of cases at a time.
• B. Incidence is the total number of existing cases; prevalence is the rate of new cases.
• C. Incidence is the rate of new cases at a given point; prevalence is the average number of cases per year.
• D. Incidence and prevalence are interchangeable.

Answer: (A)