Please indicate a water-soluble vitamin:

Question

BlackTom AI · Accepted Answer

Vitamin C (ascorbic acid) is a water-soluble vitamin; it dissolves in water, is not stored extensively in body fat, and excess is excreted in urine.

1. Relevant knowledge points and concepts
- Vitamins are classified as water-soluble (B-complex and vitamin C) or fat-soluble (A, D, E, K).
- Water-soluble vitamins are polar, dissolve in aqueous body fluids, require regular dietary intake, and are generally not stored long-term.
- Fat-soluble vitamins are lipophilic, absorbed with dietary fat and bile, stored in liver and adipose tissue, and can accumulate to toxic levels.

2. Step-by-step reasoning
- Examine each option: A, D, E, K are known fat-soluble vitamins; they are lipophilic and require fat for absorption.
- Vitamin C is chemically ascorbic acid, containing several hydroxyl groups that confer polarity and water solubility.
- Therefore, among the choices, vitamin C is the only water-soluble vitamin.

3. Intermediate “calculations” or checks (qualitative)
- Identify class: A (fat-soluble), D (fat-soluble), E (fat-soluble), K (fat-soluble) → eliminate.
- Remaining: C → water-soluble.

4. Why the correct answer is correct
- Ascorbic acid is hydrophilic, circulates in plasma, acts as an antioxidant and enzyme cofactor, and excess amounts are eliminated in urine. These biochemical and physiological properties define it as water-soluble.

5. Why other options are incorrect (briefly)
- a. A (vitamin A) — fat-soluble, stored in liver, associated with hypervitaminosis A if excessive.
- b. D (vitamin D) — fat-soluble, requires dietary fat/bile and sunlight activation; stored in fat.
- c. E (vitamin E) — fat-soluble antioxidant, lipophilic.
- d. K (vitamin K) — fat-soluble, involved in clotting factor carboxylation; stored in liver/fats.

6. Conclusion
The correct choice is e. C (vitamin C), which matches the provided answer.

Please indicate a water-soluble vitamin:单项选择题

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