Select the correct statements.
a. The most common form of prion disease that affects sheep is Creutzfeldt-Jakob disease.
b. A prion is a type of glycoprotein that can trigger normal proteins in the liver to fold abnormally .
c. Prions attack nerve cells producing naurodegerative brain disease.

Options

A. a and b only
B. c only
C. b only
D. a,b and c

Answer

To solve the question, we need to evaluate each of the three statements regarding prion diseases and determine which ones are correct.

### Step-by-Step Solution:

1. **Evaluate Statement A**: "The most common form of prion disease that affects sheep is Creutzfeldt-Jakob disease."
- **Analysis**: Creutzfeldt-Jakob disease (CJD) primarily affects humans, not sheep. The prion disease that commonly affects sheep is called "Scrapie." Therefore, this statement is incorrect.

2. **Evaluate Statement B**: "A prion is a type of glycoprotein that can trigger normal proteins in the liver to fold abnormally."
- **Analysis**: While it is true that prions can cause normal proteins to fold abnormally, they are not specifically glycoproteins, and they do not target the liver. Prions primarily affect the brain and nervous system. Therefore, this statement is also incorrect.

3. **Evaluate Statement C**: "Prions attack nerve cells producing neurodegenerative brain disease."
- **Analysis**: This statement is accurate. Prions do attack nerve cells (neurons) and lead to neurodegenerative diseases, such as CJD in humans and Scrapie in sheep. Therefore, this statement is correct.

### Conclusion:
- **Correct Statement**: Only Statement C is correct.

### Summary of Correctness:
- Statement A: Incorrect
- Statement B: Incorrect
- Statement C: Correct