Female culex acts as an intermediate host of

Options

A. Plasmodium vivax
B. Wuchereria bancrofti
C. Leishmania donovani
D. Fasciola hepatica

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The question asks about the female Culex mosquito and its role as an intermediate host. The first step is to identify which organism uses the female Culex as an intermediate host.

2. **Determine the Parasitic Worm**: The female Culex mosquito serves as an intermediate host for the parasitic worm known as *Wuchereria bancrofti*.

3. **Understand the Disease**: *Wuchereria bancrofti* is responsible for causing Filaria disease (also known as lymphatic filariasis) in humans.

4. **Identify the Hosts**: In the life cycle of *Wuchereria bancrofti*, humans are the definitive hosts where the adult worms reside, while female Culex mosquitoes are the intermediate hosts that facilitate the transmission of the larvae.

5. **Differentiate from Other Options**: The question may provide other options such as Plasmodium vivax (causes malaria), Leishmania donovani (causes kala-azar), and Fasciola hepatica (causes liver fluke). It is important to note that these organisms do not use female Culex as an intermediate host.

6. **Conclude the Answer**: Based on the information gathered, the correct answer to the question is that female Culex acts as an intermediate host for *Wuchereria bancrofti*.

### Final Answer:
Female Culex acts as an intermediate host for *Wuchereria bancrofti*.

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