Which vitamin deficiency causes pernicious anaemia?

Options

A. Vitamin `B_(1)`
B. Vitamin `B_(0)`
C. Vitamin `B_(12)`
D. Vitamin K

Answer

To solve the question "Which vitamin deficiency causes pernicious anaemia?", we can follow these steps:

### Step 1: Understand Pernicious Anaemia
Pernicious anaemia is a type of anaemia that occurs when the body cannot absorb vitamin B12 properly. This leads to a decrease in red blood cell production.

**Hint:** Think about the role of vitamins in the body, especially in the formation of red blood cells.

### Step 2: Identify the Vitamin Involved
The vitamin that is crucial for the production of red blood cells and is often deficient in pernicious anaemia is Vitamin B12.

**Hint:** Recall the vitamins that are essential for blood health and their specific functions.

### Step 3: Recognize the Cause of Deficiency
Pernicious anaemia is often caused by an autoimmune condition that affects the stomach lining, leading to a lack of intrinsic factor, which is necessary for the absorption of vitamin B12.

**Hint:** Consider how the body’s immune system can impact nutrient absorption.

### Step 4: Name the Vitamin
Vitamin B12 is also known as cyanocobalamin. This is important to note as it can be referred to by this name in various contexts.

**Hint:** Remember that some vitamins have alternative names that are used in scientific literature.

### Step 5: Identify Sources of Vitamin B12
Common dietary sources of vitamin B12 include animal products such as milk, eggs, and meat. This is important for understanding how to prevent the deficiency.

**Hint:** Think about dietary habits and how they can influence vitamin levels in the body.

### Conclusion
The deficiency of Vitamin B12 (cyanocobalamin) causes pernicious anaemia.

**Final Answer:** Vitamin B12 deficiency causes pernicious anaemia.