Deficiency of which vitamin causes the disease pernicious anaemia ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which vitamin deficiency leads to pernicious anemia. Pernicious anemia is a type of anemia that results from the inability to absorb vitamin B12.

2. **Identifying the Vitamin**: The vitamin that is specifically associated with pernicious anemia is Vitamin B12. This vitamin is crucial for the production of red blood cells and the maintenance of the nervous system.

3. **Explaining the Role of Vitamin B12**: Vitamin B12 is essential for several bodily functions:
- It helps in the formation of red blood cells.
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