Which vitamin is made most quickly vigorously in our body?

Options

A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin D

Explanation

**Step-by-Step Solution:**

1. **Identify the Vitamins**: The question asks which vitamin is made most quickly in our body. The options provided are Vitamin A, Vitamin B, Vitamin C, and Vitamin D.

2. **Understand the Synthesis of Vitamins**: Each vitamin has a different method of synthesis in the body. For instance, Vitamin A and Vitamin C are primarily obtained through diet, while Vitamin D can be synthesized in the skin.

3. **Focus on Vitamin D**: Among the vitamins listed, Vitamin D is unique because it can be synthesized by the body when the skin is exposed to sunlight.

4. **Mechanism of Vitamin D Synthesis**: When UVB rays from sunlight hit cholesterol in the skin, it triggers a chemical reaction that converts cholesterol into Vitamin D. This process occurs rapidly when there is sufficient sunlight.

5. **Conclusion**: Based on the information, Vitamin D is synthesized most quickly and vigorously in our body compared to the other vitamins listed.

6. **Final Answer**: Therefore, the vitamin that is made most quickly in our body is **Vitamin D**.

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