A: DNA is deoxyribose nucleic acid
R: RNA is ribose nucleic acid.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion
C. If Assertion is true statement but Reason is false
D. If both Assertion and Reason are false statements

Answer

To solve the question regarding the assertion and reason provided, we can follow these steps:

### Step 1: Analyze the Assertion
The assertion states: "DNA is deoxyribose nucleic acid."
- **Explanation**: This statement is true because DNA (Deoxyribonucleic Acid) is indeed composed of deoxyribose sugar, which is a five-carbon sugar molecule that lacks one oxygen atom compared to ribose.

### Step 2: Analyze the Reason
The reason states: "RNA is ribose nucleic acid."
- **Explanation**: This statement is also true because RNA (Ribonucleic Acid) is composed of ribose sugar, which is a five-carbon sugar molecule that has an additional oxygen atom compared to deoxyribose.

### Step 3: Determine the Relationship
Now we need to determine if the reason is the correct explanation for the assertion.
- **Observation**: While both statements are true, the reason (RNA being ribose nucleic acid) does not explain why DNA is called deoxyribose nucleic acid. The two statements are related in that they both describe nucleic acids, but the reason does not clarify or justify the assertion.

### Step 4: Choose the Correct Option
Based on the analysis:
- Both the assertion and the reason are true.
- However, the reason is not the correct explanation for the assertion.

Thus, the correct option is:
**Option B: Both assertion and reason are true but reason is not the correct explanation of the assertion.**