Proteoglycan is a part of which polysaccharide in cartilages?

Options

A. Chondriotin
B. Ossein
C. Cassin
D. Cartilegen

Answer

To solve the question "Proteoglycan is a part of which polysaccharide in cartilages?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand Proteoglycans**: Proteoglycans are large molecules made up of a core protein and glycosaminoglycan (GAG) chains. They play a crucial role in the structure and function of cartilage.

2. **Identify the Options**: The options provided are:
- A) Chondroitin
- B) Osin
- C) Casein
- D) Cartilagin

3. **Analyze Each Option**:
- **A) Chondroitin**: This is a glycosaminoglycan that is commonly found in cartilage. It consists of repeating disaccharide units of glucuronic acid and N-acetylgalactosamine. Chondroitin sulfate is a major component of proteoglycans in cartilage.
- **B) Osin**: This is not a recognized polysaccharide related to cartilage. It is likely a misspelling or confusion with another term.
- **C) Casein**: This is a protein found in milk, not related to cartilage.
- **D) Cartilagin**: This term seems to refer to cartilage itself, but it is not a polysaccharide.

4. **Conclusion**: Based on the analysis, the only option that correctly identifies a polysaccharide that is part of proteoglycans in cartilage is **A) Chondroitin**.

### Final Answer:
The answer to the question is **A) Chondroitin**.