Which of the following vitamins is water-soluble?

Question

BlackTom AI · Accepted Answer

Vitamin C is water-soluble because it dissolves in water, is absorbed into the bloodstream directly from the gut, is not stored to any great extent in body fat, and excess amounts are excreted in the urine.

1. Relevant knowledge points and concepts
- Solubility classifies vitamins into water-soluble (vitamin C and B-complex) and fat-soluble (vitamins A, D, E, K).
- Water-soluble vitamins: polar, circulate freely in blood, limited storage in tissues, need regular dietary intake, excess eliminated by kidneys.
- Fat-soluble vitamins: nonpolar, absorbed with dietary fats and bile, stored in adipose tissue and liver, can accumulate and cause toxicity.

2. Step-by-step reasoning process
- Identify each option: Vitamin C, A, E, D, K.
- Apply solubility rule: Is the vitamin part of the water-soluble group (C or B-complex) or fat-soluble group (A, D, E, K)?
- Vitamin C fits the water-soluble classification; the others are known fat-soluble vitamins.

3. Calculations / intermediate steps
- No numerical calculation is required. Intermediate classification steps:
  a) Check Vitamin C → member of water-soluble group.
  b) Check Vitamin A → fat-soluble.
  c) Check Vitamin E → fat-soluble.
  d) Check Vitamin D → fat-soluble.
  e) Check Vitamin K → fat-soluble.

4. Why the correct answer is correct
- Chemically, vitamin C (ascorbic acid) is polar and soluble in water; physiologically it is not stored in significant amounts and is excreted in urine when in excess. Its functions (collagen synthesis, antioxidant activity) and deficiency presentation (scurvy) reflect the need for continual intake typical of water-soluble vitamins.

5. Why the other options are incorrect
- Vitamin A: fat-soluble (stored in liver and fat; deficiency and hypervitaminosis concerns).
- Vitamin E: fat-soluble antioxidant, stored in body fat.
- Vitamin D: fat-soluble, synthesized in skin and stored in fat and liver.
- Vitamin K: fat-soluble, involved in clotting and stored to some extent.

6. Conclusion
The correct answer is Vitamin C, which matches the provided answer.

Which of the following vitamins is water-soluble?单项选择题

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Water soluble vitamins

Which of the following vitamins is water-soluble?

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