A poultry disease liver coccidiosis is caused by a protozoan

Options

A. Nosema
B. Eimeria
C. Balantidium
D. Glardia

Answer

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which protozoan causes the poultry disease known as liver coccidiosis.

2. **Identify the Options**: The options provided are:
- A) Nosema
- B) Emeria
- C) Balantidium
- D) Giardia

3. **Analyze Each Option**:
- **Nosema**: This protozoan is known to cause the disease called Pebrine, which affects silkworms. Therefore, it does not cause liver coccidiosis.
- **Emeria**: This protozoan is known to cause coccidiosis, which is indeed a poultry disease. This suggests that Emeria is a strong candidate for the correct answer.
- **Balantidium**: This protozoan causes Balantidiasis, primarily affecting pigs and rarely humans, so it is not related to poultry diseases.
- **Giardia**: This protozoan causes Giardiasis, which primarily affects various animals and humans, but not poultry.

4. **Conclusion**: After analyzing all the options, Emeria is the only protozoan that is known to cause coccidiosis in poultry, making it the correct answer.

5. **Final Answer**: The protozoan that causes liver coccidiosis in poultry is **Emeria** (Option B).