Final answer:
The correct answer is vitamin C, which is a water-soluble vitamin alongside the B-complex vitamins. Water-soluble vitamins are absorbed with water in the gastrointestinal tract, are not stored in the body, and excess is excreted in urine.
Step-by-step explanation:
The correct answer to which substance is a water-soluble vitamin is vitamin C. The water-soluble vitamins include the B-complex group of vitamins and vitamin C. The B-complex group consists of:
- Thiamine (B₁)
- Riboflavin (B₂)
- Niacin (B₃)
- Pantothenic Acid (B₅)
- Vitamin B6
- Biotin (B₇)
- Folic Acid (B₉)
- Cobalamin (B₁₂)
Vitamin C, also known as ascorbic acid, is another water-soluble vitamin. These vitamins are absorbed with water in the gastrointestinal tract and they move easily through bodily fluids. They are not stored in the body and any excess consumption of these vitamins is typically excreted in the urine. Therefore, hypervitaminosis, which is vitamins toxicity, is rare unless in cases of excessive supplementation.