Name an immunosuppressive agent.

Explanation

**Step-by-Step Solution:**

1. **Understanding Immunosuppressive Agents**:
- Immunosuppressive agents, also known as immunosuppressive drugs or immunosuppressants, are substances that inhibit or prevent the activity of the immune system. They are used to reduce the immune response in various medical conditions.

2. **Function of Immunosuppressive Agents**:
- These agents work by suppressing or reducing the strength of the body's immune system, which can be beneficial in situations such as organ transplants, autoimmune diseases, and certain inflammatory conditions.

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