Assertion `:` Deficiency of vitamin `B_(12)` and folic acid can cause anaemia.
Reason `:-` Vitamin `B_(12)` and folic acid are essential for maturation of RBC.

Options

A. 1)If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion .
B. 2)If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
C. 3)If Assertion is True but the Reason is False.
D. 4)If both Assertion & Reason are false.

Answer

To solve the question regarding the assertion and reason about vitamin B12, folic acid, and anemia, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that a deficiency of vitamin B12 and folic acid can cause anemia.
- Anemia is characterized by a reduced number of healthy red blood cells (RBCs) in the blood, which can lead to symptoms such as fatigue and shortness of breath.

2. **Analyzing the Reason**:
- The reason provided is that vitamin B12 and folic acid are essential for the maturation of RBCs.
- Both vitamins play crucial roles in the production and maturation of red blood cells in the bone marrow.

3. **Establishing the Relationship**:
- Since a deficiency in these vitamins leads to improper maturation of RBCs, it follows that this can result in anemia due to the reduced number of functional RBCs.

4. **Conclusion**:
- Both the assertion and the reason are correct statements.
- The reason correctly explains why the assertion is true, as the maturation of RBCs is directly affected by the levels of vitamin B12 and folic acid.

5. **Selecting the Correct Option**:
- Based on the analysis, the correct option is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.

### Final Answer:
The correct option is **Option 1**: Both the assertion and reason are true, and the reason is the correct explanation of the assertion.

---