Which of the following vitamins is part of a coenzyme that participates in energy metabolism?

Question

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Niacin is part of the coenzymes NAD and NADP, which are essential to energy metabolism pathways, including the conversion of carbohydrates, fats, and proteins into ATP (adenosine triphosphate), the body's main source of cellular energy. Vitamins A and K play roles in vision and blood clotting, respectively, while ascorbic acid (vitamin C) acts as an antioxidant and is involved in collagen synthesis.

Which of the Following Vitamins Is Part of a Coenzyme