Intermediate host is absent in the infection of

Options

A. Plasmodium
B. Trypanosoma
C. Entamoeba
D. filarial worm.

Explanation

To solve the question "Intermediate host is absent in the infection of," we need to analyze each of the given options to determine which organism does not require an intermediate host for its life cycle.

### Step-by-Step Solution:

1. **Understanding the Question**:
- The question asks which organism does not have an intermediate host in its infection cycle. An intermediate host is a host that supports the immature or non-reproductive forms of a parasite.

2. **Analyzing Each Option**:
- **Option A: Plasmodium**
- Plasmodium is the causative agent of malaria. It requires a mosquito (Anopheles) as an intermediate host for its life cycle. Therefore, this option is incorrect.

- **Option B: Trypanosoma**
- Trypanosoma is responsible for diseases such as sleeping sickness. It is transmitted by the tsetse fly, which acts as an intermediate host. Thus, this option is also incorrect.

- **Option C: Entamoeba (specifically Entamoeba histolytica)**
- Entamoeba histolytica is a protozoan parasite that causes amoebic dysentery. It is a monogenetic parasite, meaning it lives in a single host (humans) and does not require an intermediate host. Therefore, this option is correct.

- **Option D: Filarial Worm**
- Filarial worms are parasitic worms that require two hosts: an arthropod (like a mosquito) as the intermediate host and a vertebrate as the primary host. Hence, this option is incorrect.

3. **Conclusion**:
- After analyzing all the options, the correct answer is **Option C: Entamoeba** (specifically Entamoeba histolytica), as it does not require an intermediate host in its infection cycle.

### Final Answer:
The correct answer is **C: Entamoeba**.