The disease which is caused by helminth parasite of man's blood that has an intermediate host of snail is ?

Options

A. Liver rot
B. Bilharzia
C. Ascariasis
D. Filariasis

Answer

To solve the question regarding the disease caused by a helminth parasite of man's blood that has an intermediate host of a snail, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Type of Parasite**: The question specifies a helminth parasite. Helminths are worms, and in this context, we are looking for a type that affects humans and is found in the blood.

2. **Consider the Intermediate Host**: The question mentions that the intermediate host is a snail. This is crucial because it helps narrow down the possible diseases.

3. **Review the Options**: The options provided are:
- a) Liver rot
- b) Bilharzia
- c) Ascariasis
- d) Pylaryasis

4. **Analyze Each Option**:
- **Liver rot**: This is not a disease associated with a helminth or a snail.
- **Bilharzia**: Also known as schistosomiasis, this disease is caused by blood flukes (helminths) and has snails as its intermediate host.
- **Ascariasis**: This is caused by Ascaris lumbricoides, a roundworm, and does not involve snails.
- **Pylaryasis**: This is not a recognized disease related to helminths or snails.

5. **Conclusion**: Based on the analysis, the disease that matches all the criteria (helminth parasite, affects man's blood, and has a snail as an intermediate host) is **Bilharzia**.

### Final Answer:
The disease caused by a helminth parasite of man's blood that has an intermediate host of a snail is **Bilharzia**.

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