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  1. The vitamin that is most readily manufactured in our bodies is
    1. vitamin A
    2. vitamin B
    3. vitamin C
    4. vitamin D
Correct Option: D

Vitamin D is not really a vitamin, but a precursor for the most potent steroid hormone in the human body. It can be obtained from exposure to the sun’s ultraviolet (UV) radiation, especially during the early morning hours.



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