Adult Wuchereria bancrofti attacks

Options

A. exeretory system
B. nervous sytem
C. blood circulation
D. lymph vessels.

Explanation

**Step-by-Step Solution:**

1. **Identify the Organism**: The question refers to Wuchereria bancrofti, which is a type of filarial worm.

2. **Understand the Disease**: Wuchereria bancrofti is known to cause a disease called Elephantiasis, which is characterized by severe swelling of the limbs and other body parts.

3. **Determine the Affected System**: The adult Wuchereria bancrofti primarily attacks the lymphatic system. This is where the adult worms reside and reproduce.

4. **Mechanism of Damage**: The presence of these worms in the lymphatic vessels leads to chronic inflammation and blockage of the lymphatic system. This blockage prevents proper drainage of lymph fluid.

5. **Consequences of the Attack**: The blockage results in the accumulation of lymph fluid in the interstitial spaces, leading to swelling (edema) in the affected areas, particularly the lower limbs and genital organs.

6. **Identify the Vector**: The transmission of Wuchereria bancrofti occurs through the bite of infected mosquitoes, primarily the Culex species.

7. **Conclusion**: Based on the above points, the correct answer to the question is that adult Wuchereria bancrofti attacks the lymphatic system in humans.

**Final Answer**: The adult Wuchereria bancrofti attacks the lymphatic system.

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