Which of the following fibres are made of polyamides?

Options

A. Wool
B. Natural silk
C. `ABS` plastic
D. `SBR`

Explanation

To determine which of the following fibers are made of polyamides, we need to understand what polyamides are and identify the options provided.

### Step-by-Step Solution:

1. **Define Polyamides**:
- Polyamides are polymers that contain amide bonds (-C(=O)N-). They can be classified into natural and artificial (synthetic) polyamides.

2. **Identify Natural Polyamides**:
- Natural polyamides include fibers such as wool and silk. These are derived from natural sources.

3. **Identify Artificial Polyamides**:
- Artificial polyamides are typically produced through synthetic processes. A common example of an artificial polyamide is nylon, which is formed through step-growth polymerization.

4. **Analyze the Options**:
- **Option 1: Wool** - This is a natural polyamide.
- **Option 2: Silk** - This is also a natural polyamide.
- **Option 3: ABS Plastic** - Acrylonitrile Butadiene Styrene (ABS) is a thermoplastic polymer, not a polyamide.
- **Option 4: SBR (Styrene Butadiene Rubber)** - This is a synthetic rubber made from a copolymer of styrene and butadiene, and it is not a polyamide.

5. **Conclusion**:
- The fibers made of polyamides from the given options are wool and silk. Therefore, the correct answers are Option 1 (Wool) and Option 2 (Silk).

### Final Answer:
- The fibers made of polyamides are **Wool** and **Silk**.