In the body, the Vitamin A/Retinoids family of molecules are powerful molecules that control many processes. But most of us get Vitamin A from dietary:

Question

BlackTom AI · Accepted Answer

The question asks about how most people obtain Vitamin A for the body, specifically noting the Vitamin A/Retinoids family.
Option 1: 'beta carotene and other pigments' correctly identifies dietary sources such as beta-carotene, which the body can convert to retinol, the active form of Vitamin A. This matches standard nutrition guidance.
Option 2: 'cell wall waxes' are not known to be dietary sources of Vitamin A; they are plant surface components and do not contribute retinoids in a meaningful way.
Option 3: 'fiber containing bran' provides dietary fiber and certain micronutrients, but it is not a source of Vitamin A; bran does not supply retinoids or carotenoids in a form that the body uses as Vitamin A.
Option 4: 'structural cellulose' is a structural carbohydrate in plants that humans cannot digest for nutrient value; it does not supply Vitamin A or carotenoids.
Hence, the plausible and accurate source among the choices is the first option, which points to beta carotene and related pigments as dietary precursors to Vitamin A.

In the body, the Vitamin A/Retinoids family of molecules are powerful molecules that control many processes. But most of us get Vitamin A from dietary:单项选择题

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