All the following cells produces collagen except :-

Options

A. Osteoblast
B. Chondroblast
C. Fibro blast
D. Mast cells

Answer

To answer the question "All the following cells produce collagen except:", we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- Osteoblast
- Chondroblast
- Fibroblast
- Mast cell

2. **Understand Osteoblasts**:
- Osteoblasts are specialized cells involved in bone formation. They are responsible for producing the extracellular matrix of bone, which includes collagen.
- **Conclusion**: Osteoblasts produce collagen.

3. **Understand Chondroblasts**:
- Chondroblasts are cells that form cartilage. They also produce collagen as part of the cartilage matrix.
- **Conclusion**: Chondroblasts produce collagen.

4. **Understand Fibroblasts**:
- Fibroblasts are the most common type of cells found in connective tissues. They play a crucial role in producing collagen and other fibers that provide structural support to tissues.
- **Conclusion**: Fibroblasts produce collagen.

5. **Understand Mast Cells**:
- Mast cells are derived from myeloid stem cells and are part of the immune system. They contain granules rich in histamine and heparin, which are involved in allergic reactions and inflammation.
- **Conclusion**: Mast cells do not produce collagen.

6. **Final Answer**:
- Among the options given, the cell that does not produce collagen is the **Mast cell**.