Which statement about vitamin A is FALSE?

Question

BlackTom AI · Accepted Answer

Question focus: evaluating statements about vitamin A to identify which one is false.
Option 1: 'Vitamin A is a component of visual pigment in the retina' — This is true. Vitamin A (in the form of retinal) is a critical component of rhodopsin, the visual pigment in rod cells, enabling vision in low light.
Option 2: 'Vitamin A is involved in tissue growth and differentiation' — This is true. Vitamin A participates in gene expression, cell differentiation, and growth, influencing epithelial integrity and development.
Option 3: 'Vitamin A toxicity is unlikely to occur' — This is false. Hypervitaminosis A can occur with chronic intake of high-dose retinoids or accidental over-supplementation, leading to symptoms such as liver toxicity, teratogenic effects, and bone abnormalities. The claim that toxicity is unlikely contradicts well-established concerns about vitamin A overdose.
Option 4: 'Vitamin A is the only carotenoid that is an essential nutrient' — This is false. While vitamin A is essential, many carotenoids are not considered essential nutrients in humans. Some carotenoids (like beta-carotene, lycopene, lutein) have health benefits but are not classified as essential nutrients, and dietary requirements do not mandate all carotenoids. The statement incorrectly asserts exclusivity and essentiality.

Which statement about vitamin A is FALSE?单项选择题

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