Hardest substance in human body is

Options

A. Bone
B. Cartilage
C. Ribs
D. Enamel

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the hardest substance in the human body.

2. **List the Options**: The options provided are:
- Bone
- Cartilage
- Ribs
- Enamel

3. **Analyze Each Option**:
- **Bone**: While bones are strong, they are not the hardest substance in the body. They are made up of calcium and other minerals.
- **Cartilage**: This is a flexible connective tissue found in various parts of the body, such as joints. It is not hard and therefore not the hardest substance.
- **Ribs**: Ribs are bones that protect the chest cavity, but like other bones, they are not harder than enamel.
- **Enamel**: This is the outermost layer of the teeth and is known to be the hardest substance in the human body.

4. **Conclusion**: Based on the analysis, the hardest substance in the human body is **enamel**.

5. **Final Answer**: Enamel is the hardest substance in the human body.

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