Which of these is an example of thermosetting plastics?

Options

A. Teflon
B. Melamine
C. Polythene
D. Polyvinyl chloride

Explanation

**Step-by-Step Solution:**

1. **Understanding Thermosetting Plastics:**
- Thermosetting plastics are types of polymers that become irreversibly hard when heated. Unlike thermoplastics, which can be remolded upon heating, thermosetting plastics maintain their shape and structure after the initial setting.

2. **Identifying Examples:**
- Common examples of thermosetting plastics include:
- Bakelite
- Melamine
- Epoxy resins
- Urea-formaldehyde

3. **Analyzing the Options:**
- If provided with options, look for materials that are known to be thermosetting plastics. In this case, melamine is mentioned as an example.

4. **Conclusion:**
- Based on the information, the correct answer to the question "Which of these is an example of thermosetting plastics?" is **melamine**.