An incorrect match is

Answer

To determine the incorrect match among the given options related to vitamin deficiencies and their associated diseases, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Vitamins and Their Deficiencies**:
- **Vitamin B12**: Deficiency leads to a condition called pernicious anemia.
- **Vitamin B1**: Deficiency leads to a condition known as beriberi.
- **Vitamin B2**: Deficiency leads to a condition called ariboflavinosis, not pellagra.

2. **Analyze Each Option**:
- **Option B12 - Pernicious Anemia**: This is a correct match. Vitamin B12 deficiency does indeed cause pernicious anemia.
- **Option B1 - Beriberi**: This is also a correct match. Vitamin B1 deficiency results in beriberi.
- **Option B2 - Pellagra**: This is an incorrect match. Pellagra is caused by a deficiency of niacin (Vitamin B3), not Vitamin B2.

3. **Conclusion**:
- The incorrect match is **B2 - Pellagra**. Pellagra is associated with niacin deficiency, not Vitamin B2.

### Final Answer:
The incorrect match is **B2 - Pellagra**.