Mention any one symptom of elephantiasis. Name its causative agent.

Explanation

**Step-by-Step Solution:**

1. **Identify the Disease**: The disease in question is Elephantiasis, which is also known as filariasis.

2. **Mention a Symptom**: One of the main symptoms of Elephantiasis is significant swelling in the legs and the scrotum region. This swelling can cause the affected areas to resemble the legs of an elephant, which is how the disease got its name.

3. **Identify the Causative Agent**: The causative agent of Elephantiasis is a type of filarial worm known as Wuchereria bancrofti. This parasite is responsible for causing the disease by infecting the lymphatic system.

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