The infection by a protozoan such as Entamoeba can lead to colitis which is characterized by
Loose motion
Bloody feces
Dehydration
All of these

Options

A. Loose motion
B. Bloody feces
C. Dehydration
D. All of these

Answer

To answer the question regarding the infection by a protozoan such as Entamoeba and its characteristics related to colitis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Infection**:
- The protozoan Entamoeba histolytica is known to cause amoebiasis, which can lead to intestinal issues, including colitis.

2. **Identifying Symptoms of Amoebiasis**:
- The primary symptoms associated with amoebiasis include:
- **Loose motion**: This refers to diarrhea, which is a common symptom of intestinal infections.
- **Bloody feces**: The infection can cause inflammation and ulceration in the intestines, leading to the presence of blood in the stool.
- **Dehydration**: Due to excessive loss of fluids from diarrhea, dehydration is a significant concern in cases of amoebiasis.

3. **Analyzing the Options**:
- The question provides four options:
- Loose motion
- Bloody feces
- Dehydration
- All of these
- Since all three symptoms (loose motion, bloody feces, and dehydration) are characteristic of the infection caused by Entamoeba histolytica, we can conclude that the correct answer encompasses all the symptoms.

4. **Final Conclusion**:
- Therefore, the correct answer to the question is **All of these**.