Name the antibody which is most effective in allergies.

Explanation

### Step-by-Step Solution:

1. **Understanding Antibodies**:
- Antibodies, also known as immunoglobulins, are proteins produced by B lymphocytes (a type of white blood cell) that help the immune system identify and neutralize foreign objects like bacteria and viruses.

2. **Types of Antibodies**:
- There are five main types of antibodies in the human body:
- IgA (Immunoglobulin A)
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