To determine which statement is correct regarding the diseases and organisms mentioned, let's analyze each statement step by step.
### Step-by-Step Solution:
1. **Evaluate the First Statement:**
- **Statement:** "Set-C fly spreads Kala azar."
- **Analysis:** This statement is incorrect. Kala azar, also known as visceral leishmaniasis, is spread by the bite of infected female sandflies, not Set-C flies. Set-C flies are associated with sleeping sickness.
**Hint:** Remember that Kala azar is linked to sandflies, while Set-C flies are linked to a different disease.
2. **Evaluate the Second Statement:**
- **Statement:** "Set-C fly is present in sleeping sickness."
- **Analysis:** This statement is partially correct. The Set-C fly (Glossina species) does indeed spread sleeping sickness, which is caused by the Trypanosoma brucei parasite. However, the statement incorrectly mentions that it spreads Lishmania, which is not true.
**Hint:** Focus on the specific diseases associated with each fly; Set-C flies are linked to sleeping sickness.
3. **Evaluate the Third Statement:**
- **Statement:** "Trachonempha, a symbiotic protozoan, is found in the gut of termites."
- **Analysis:** This statement is correct. Trachonempha is a protozoan that lives in the hindgut of termites, aiding in the digestion of cellulose.
**Hint:** Symbiotic relationships often involve organisms that help each other, like Trachonempha in termites.
4. **Evaluate the Fourth Statement:**
- **Statement:** "Endoparasite is a parasite which is present in the body; Pediculus humanus corporeus is for lice."
- **Analysis:** This statement is incorrect. While Pediculus humanus corporeus (body louse) is indeed a parasite, it is an ectoparasite, meaning it lives on the outside of the host's body, not inside.
**Hint:** Distinguish between endoparasites (inside the body) and ectoparasites (on the body).
### Conclusion:
After evaluating all statements, the correct statement is the third one: "Trachonempha, a symbiotic protozoan, is found in the gut of termites."
### Final Answer:
The correct statement is option 3: "Trachonempha, a symbiotic protozoan, is found in the gut of termites."
