Which vitamin is listed as water-soluble in the material?

• A. Vitamin A
• B. Vitamin D
• C. Vitamin C
• D. Vitamin K

Answer: (C)

Water-soluble vitamins dissolve in water and are not stored in the body in large amounts, so they must be consumed regularly. Among these, the vitamin listed as water-soluble is vitamin C. It is not stored in significant amounts and any excess is excreted in urine, which is typical for water-soluble vitamins. Vitamin C plays a role in collagen synthesis and acts as an antioxidant. In contrast, the other vitamins listed—A, D, and K—are fat-soluble. They require fat for absorption and are stored in the liver and fatty tissues, with a greater potential to accumulate. That makes vitamin C the correct choice.