The Fact That One Microgram of Retinol and 12 Micrograms

Multiple Choice

The fact that one microgram of retinol and 12 micrograms of dietary beta-carotene are both equal to one retinol activity equivalent indicates that:

A) retinol has greater activity than beta-carotene.
B) beta-carotene is not a significant dietary source of vitamin A.
C) toxicity is more likely to occur with beta-carotene than retinol.
D) beta-carotene is absorbed and converted less efficiently than retinoids.
E) most individuals would benefit from retinol supplements.