The question asks to identify the nutrient with three active forms: retinal, retinol, and retinoic acid.
Vitamin A Forms Explained
Vitamin A is a crucial fat-soluble vitamin known to exist in several active forms. The three primary active forms mentioned are:
- Retinol: Essential for vision, immune function, reproduction, and cellular communication.
- Retinal: Also known as aldehyde form, critical for the visual cycle (detecting light).
- Retinoic Acid: Functions as a hormone, regulating cell growth, differentiation, and development.
These forms are interconvertible and play distinct but vital roles in the body. Therefore, Vitamin A is the correct answer.
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