Name two hosts of filarial worms.

Explanation

**Step-by-Step Solution:**

1. **Understanding Filarial Worms**: Filarial worms are parasitic worms that can cause diseases in humans and other animals. They are known to cause chronic inflammation and affect various organs, particularly the lymphatic system.

2. **Identifying Hosts**: Filarial worms have two types of hosts: a primary host and a secondary host. The primary host is where the adult worms live and reproduce, while the secondary host is involved in the transmission of the parasite.

3. **Primary Host**: In the case of filarial worms, the primary host is **humans**. Humans can become infected with filarial worms, leading to diseases such as lymphatic filariasis (also known as elephantiasis).

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