Suggest a method to ensure an anamnetic response in humans.

Explanation

**Step-by-Step Solution:**

1. **Understanding Anamnestic Response**: The anamnestic response, or secondary immune response, refers to the rapid and robust production of antibodies upon re-exposure to a pathogen that the body has previously encountered. This is due to the memory cells generated during the first exposure.

2. **Role of Vaccination**: Vaccination is a method used to ensure an anamnestic response. When a vaccine is administered, it introduces a harmless component of the pathogen (which can be a killed or weakened form of the virus or bacteria) into the body. This prompts the immune system to recognize the pathogen and produce specific antibodies against it.

3. **Types of Vaccines**: Vaccines can be classified into:
- **Killed (Inactivated) Vaccines**: These contain pathogens that have been killed or inactivated so they cannot cause disease (e.g., polio vaccine).
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