Which of the following is water soluble vitamin?

Appeared in: NVS- 2025

Explanation

Vitamin C, also known as ascorbic acid, is classified as a water-soluble vitamin.
Water-soluble vitamins dissolve in water and are not stored in the body for long periods.
Excess amounts of water-soluble vitamins are excreted through the urine, which necessitates regular dietary intake to prevent deficiency.
Sources of Vitamin C include citrus fruits (oranges, lemons), amla, guava, tomatoes, and green leafy vegetables.

Option A: Vitamin K is a fat-soluble vitamin, not a water-soluble one. It is stored in the liver and fatty tissues.
Option C: Vitamin A (retinol) is a fat-soluble vitamin. It is stored in the liver and is essential for vision, immune function, and cell growth.
Option D: Vitamin D is a fat-soluble vitamin. It is synthesized in the skin upon exposure to sunlight and is also obtained from dietary sources.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of vitamins based on solubility (fat-soluble vs. water-soluble) as background academic context rather than a clinical decision trigger.
Nurses must educate patients that fat-soluble vitamins (A, D, E, K) can accumulate and cause toxicity if taken in excess, whereas water-soluble vitamins (C, B) are generally safer as excess is excreted.
When administering vitamins, fat-soluble vitamins should be given with a meal containing fat to enhance absorption.
Patients with conditions affecting fat absorption (e.g., cystic fibrosis, celiac disease, Crohn's disease) are at higher risk for deficiencies of fat-soluble vitamins.

How to Approach the Question

First, identify the core concept of the question, which is the classification of vitamins.
The keyword is 'water-soluble'. Recall the two main categories of vitamins: fat-soluble and water-soluble.
Remember the mnemonic 'ADEK' for the four fat-soluble vitamins (A, D, E, K).
Evaluate each option against this classification.
Option A (Vitamin K), Option C (Vitamin A), and Option D (Vitamin D) are all part of the 'ADEK' group, making them fat-soluble.
This leaves Vitamin C as the only water-soluble vitamin in the list.

Concept Tested & Keywords

Concept Tested: Classification of vitamins based on solubility (fat-soluble vs. water-soluble).
Stem keywords: water soluble vitamin
Lead-in keywords: Which
Negative lead-in flag: false

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E6 textbook of Applied Biochemistry and Nutrition & DieteticsHarbans Lal (pp 26-464 of 479) p. 287-289

E6 Nutrition Monika Sharma 3e p. 110-112

E6 Biochemistry U Satyanarayana— Part 1 (pp 26-420 of 840) p. 108-110

Practise the full NVS- 2025

Attempt every question from this paper in a timed mock, then review the full solution for each one.