`60%` inorganic components are present in

Options

A. Cartilage
B. Bone
C. Connective tissue
D. None of these.

Answer

To solve the question regarding which structure contains 60% inorganic components, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components of Bone**:
- Bone is a type of connective tissue that consists of both organic and inorganic components.

2. **Understand the Composition of Bone**:
- The organic part of bone primarily consists of collagen fibers, which make up about 90-95% of the organic matrix.
- The inorganic part mainly consists of mineral salts, particularly calcium phosphate, which is present in the form of calcium hydroxyapatite.

3. **Determine the Percentage of Inorganic Components**:
- It is established that approximately 60% of the composition of bone is inorganic, which provides rigidity and hardness to the bone structure.

4. **Evaluate the Options Provided**:
- **Cartilage**: This is another type of connective tissue but does not have the same level of mineralization as bone, making it incorrect.
- **Bone**: This is the correct answer since it contains about 60% inorganic components.
- **Connective Tissue**: This is a broad category that includes various types of tissues, including bone and cartilage, but does not specifically indicate the percentage of inorganic components.
- **None of These**: This option is also incorrect since bone fits the criteria.

5. **Conclusion**:
- Based on the analysis, the correct answer is **Bone** as it contains 60% inorganic components.

### Final Answer:
**Bone**