Elephantiasis is caused by

Options

A. Wuchereria
B. Pinworm
C. Planarians
D. Liver flukes

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the cause of elephantiasis. We need to identify the correct organism responsible for this disease from the given options.

2. **Analyzing the Options**: The options provided are:
- Option 1: Vacheria
- Option 2: Pinworm
- Option 3: Planarians
- Option 4: Liver Fluke

3. **Identifying the Correct Option**:
- **Vacheria**: This is a human parasite known to cause elephantiasis. It is transmitted through the bite of mosquitoes, which act as vectors for the disease.
- **Pinworm**: This is a common intestinal parasite that causes enterobiasis, not elephantiasis.
- **Planarians**: These are non-parasitic flatworms that do not derive nutrition from other organisms and are not related to elephantiasis.
- **Liver Fluke**: These are flatworms that cause liver rot, but they do not cause elephantiasis.

4. **Conclusion**: Based on the analysis, the correct answer is **Option 1: Vacheria**, as it is the only organism listed that is known to cause elephantiasis.

---