Multiple choice

The active form of vitamin A is...

  1. Beta-carotene

  2. Hemoglobin

  3. Food vehicle

  4. Retinol

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Retinol is the preformed, active form of vitamin A found in animal-derived foods. Beta-carotene, on the other hand, is a precursor (provitamin) found in plants that must be converted by the body into retinol.