Name the organism responsible for filarial disease.

Explanation

**Step-by-Step Solution:**

1. **Identify the Disease**: The question asks for the organism responsible for filarial disease. Filarial disease is a condition caused by parasitic worms.

2. **Determine the Type of Organism**: The organism responsible for filarial disease is a type of worm, specifically known as a filarial worm.

3. **Name the Specific Organism**: The specific organism that causes filarial disease is called *Wuchereria bancrofti*.

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