Assertion : DNA isconsidered to be better gentic material than RNA for most organisms.
Reason : 2' -OH group present in DNA makes it labile and less reactive.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. if both assertion and reason are false.

Explanation

### Step-by-Step Solution

1. **Understanding the Assertion**: The assertion states that DNA is considered to be better genetic material than RNA for most organisms. This is true because DNA is more stable and less reactive compared to RNA, making it a more reliable carrier of genetic information.

2. **Understanding the Reason**: The reason provided is that the 2'-OH group present in DNA makes it labile and less reactive. This statement is incorrect. The 2'-OH group is actually present in RNA, not DNA. The presence of this hydroxyl group in RNA makes it more reactive and less stable compared to DNA.

3. **Comparing DNA and RNA**:
- DNA (Deoxyribonucleic Acid) lacks the 2'-OH group, which contributes to its stability. It has a double-stranded structure that is anti-parallel and more resistant to hydrolysis.
- RNA (Ribonucleic Acid) has the 2'-OH group, which makes it more reactive and prone to degradation, thus less stable.

4. **Conclusion**: Based on the above points, we can conclude that the assertion is true (DNA is better genetic material), while the reason is false (the 2'-OH group is present in RNA, not DNA). Therefore, the correct answer is that the assertion is true and the reason is false.

### Final Answer
- Assertion: True
- Reason: False