Which set includes pathogenic artropods

Options

A. Tse-tse fly, mosquito, flea-plague
B. Crab, Culex, spider
C. Anopheles, culex, cray-fish
D. Silver-fish, housefly, sand-fly

Answer

To determine which set includes pathogenic arthropods, we need to analyze each option provided in the question. Pathogenic arthropods are those that can spread diseases to humans or other animals.

### Step-by-Step Solution:

1. **Identify the Options**:
- Option 1: Tsetse fly, mosquito, flea plague
- Option 2: Crab, Culex, spider
- Option 3: Anopheles, Culex, crayfish
- Option 4: Silverfish, housefly, sandfly

2. **Analyze Option 1**:
- **Tsetse Fly**: Known to spread sleeping sickness (African trypanosomiasis).
- **Mosquito**: Known to transmit various diseases such as malaria, dengue, and Zika virus.
- **Flea**: Known to spread plague.
- **Conclusion**: All three (tsetse fly, mosquito, flea) are pathogenic arthropods.

3. **Analyze Option 2**:
- **Crab**: Generally not known to spread diseases.
- **Culex**: A type of mosquito that can transmit diseases like West Nile virus.
- **Spider**: Generally not considered pathogenic in terms of spreading diseases.
- **Conclusion**: This option does not include all pathogenic arthropods due to the presence of crab and spider.

4. **Analyze Option 3**:
- **Anopheles**: A mosquito known for spreading malaria.
- **Culex**: As mentioned, it is pathogenic.
- **Crayfish**: Not known to be pathogenic.
- **Conclusion**: This option does not include all pathogenic arthropods due to the presence of crayfish.

5. **Analyze Option 4**:
- **Silverfish**: Not known to be pathogenic.
- **Housefly**: Can carry and spread various diseases.
- **Sandfly**: Known to spread leishmaniasis.
- **Conclusion**: This option does not include all pathogenic arthropods due to the presence of silverfish.

6. **Final Conclusion**:
- The first option (tsetse fly, mosquito, flea) is the only one that includes all pathogenic arthropods. Therefore, it is the correct answer.

### Final Answer:
**The set that includes pathogenic arthropods is: Tsetse fly, mosquito, flea plague.**

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