What is the difference between incidence and prevalence?

What is the difference between incidence and prevalence?

• A. Incidence is total cases; prevalence is new cases.
• B. Incidence is new cases in a defined period; prevalence is total existing cases at a point or period.
• C. Incidence is the rate of deaths; prevalence is recovery rate.
• D. Incidence and prevalence are the same.

Answer: (B)