How are vitamins classified? Name the vitamin responsible for the coagulation of blood.

Explanation

### Step-by-Step Solution

1. **Understanding Vitamins**: Vitamins are organic compounds that are essential for various biological functions in the body. They are required in small amounts in our diet.

2. **Classification of Vitamins**: Vitamins can be classified based on their solubility:
- **Fat-Soluble Vitamins**: These vitamins dissolve in fats and oils. The fat-soluble vitamins include:
- Vitamin A
- Vitamin D
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