Which of the following is a water-soluble vitamin?

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

Answer: (B)

Water-soluble vitamins dissolve in water and aren’t stored in large amounts in the body. They’re absorbed with meals and any excess is typically excreted in urine, so you need regular daily intake to prevent deficiency. Vitamin C is a water-soluble vitamin, whereas the other options—A, D, and K—are fat-soluble, stored in the liver and fat tissues, and can accumulate with excess. So vitamin C is the correct water-soluble choice.