Filariasis is caused by ………………………………… worm.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Filariasis**: Filariasis is a disease caused by parasitic worms that belong to the group known as filarial worms.

2. **Identifying the Causative Agent**: The specific worms that cause filariasis are primarily Wuchereria bancrofti. This is the most common filarial worm associated with the disease.

3. **Effects of the Disease**: Filariasis leads to chronic inflammation, particularly affecting the lymphatic system. It can cause severe swelling in the limbs and genital organs, a condition known as elephantiasis.

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