Choose the odd one out.
(a) Keratin phosphate
(b) Hyaluronic acid
(c) Chodriotin sulphate
(d) Alginic acid

Options

A. Keratin phosphate
B. yaluronic acid
C. chodriotion sulphate
D. Alginic acid

Answer

To determine the odd one out from the given options, we need to analyze the nature of each compound listed:

1. **Keratin phosphate**: This is a protein that contains keratin, which is rich in sulfur-containing amino acids like cysteine. It is primarily found in hair, nails, and the outer layer of skin.

2. **Hyaluronic acid**: This is a glycosaminoglycan (a type of carbohydrate) that is found in connective tissues, skin, and cartilage. It does not contain sulfur.

3. **Chondroitin sulfate**: This is another glycosaminoglycan that is often found in cartilage. It contains sulfur in the form of sulfate groups.

4. **Alginic acid**: This is a polysaccharide that is derived from brown algae. It is used as a thickening agent and does not contain sulfur.

Now, let's summarize the findings:

- **Keratin phosphate**: Contains sulfur.
- **Hyaluronic acid**: Does not contain sulfur.
- **Chondroitin sulfate**: Contains sulfur.
- **Alginic acid**: Does not contain sulfur.

From the analysis, we can see that both hyaluronic acid and alginic acid do not contain sulfur, but hyaluronic acid is a glycosaminoglycan, while alginic acid is a polysaccharide. However, the main distinction is that keratin phosphate and chondroitin sulfate are both associated with proteins and connective tissues that contain sulfur.

Thus, the odd one out is **(b) Hyaluronic acid** because it is the only one that is not a protein or a sulfur-containing compound.

### Step-by-Step Solution:
1. Identify the nature of each compound.
2. Determine which compounds contain sulfur.
3. Compare the compounds based on their classification (protein vs. carbohydrate).
4. Conclude which one does not fit the pattern.