Which of the following vitamin is water soluble?

Vitamin C

The correct answer is option 4. Vitamin C.

Vitamins are classified into two main categories based on their solubility: water-soluble and fat-soluble. Each category has distinct properties and roles in the body.

Water-Soluble Vitamins

Vitamin C is a water-soluble vitamin, meaning it dissolves in water and is not stored in the body for long periods. It needs to be consumed regularly through the diet. Here are some key points about Vitamin C:

Function: Vitamin C (ascorbic acid) plays a crucial role in several physiological functions:

Collagen Synthesis: It is essential for the production and maintenance of collagen, a structural protein found in connective tissues, skin, blood vessels, and bones.

Antioxidant: It acts as an antioxidant, protecting cells from damage by free radicals.

Immune Function: Vitamin C supports the immune system by enhancing the function of white blood cells and improving the body's ability to fight infections.

Absorption of Iron: It improves the absorption of non-heme iron (from plant-based sources) in the digestive tract.

Sources: Vitamin C is found in a variety of fruits and vegetables, such as oranges, strawberries, kiwi, bell peppers, and broccoli.

Fat-Soluble Vitamins

In contrast, the following vitamins are fat-soluble, meaning they dissolve in fats and oils and are stored in the liver and fatty tissues:

Vitamin A: Important for vision, immune function, and skin health. Found in liver, dairy products, and beta-carotene-rich vegetables like carrots.

Vitamin D: Essential for calcium absorption and bone health. It can be synthesized by the body when exposed to sunlight and is also found in fortified foods and fatty fish.

Vitamin K: Crucial for blood clotting and bone health. Found in leafy green vegetables, such as spinach and kale, and certain vegetable oils.

Summary

Vitamin C is the only water-soluble vitamin among the options given. It is necessary for collagen synthesis, antioxidant protection, immune support, and enhancing iron absorption.

Vitamin A, D, and K are all fat-soluble vitamins, each playing unique roles in the body related to vision, bone health, and blood clotting, respectively.