Assertion : Restriction enzymes recongise palindromic sequences.
Reason : Palindromic sequences read same in both directions of the two strand.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Restriction enzymes recognize palindromic sequences."
- This is true because restriction enzymes are designed to identify specific sequences of nucleotides in DNA, and many of these sequences are palindromic.

2. **Understanding the Reason**:
- The reason states that "Palindromic sequences read the same in both directions of the two strands."
- This is also true. A palindromic sequence is one that reads the same forwards and backwards on complementary strands of DNA.

3. **Evaluating the Relationship**:
- While both the assertion and reason are true, we need to determine if the reason correctly explains the assertion.
- The assertion is about the ability of restriction enzymes to recognize palindromic sequences, while the reason describes the nature of palindromic sequences.

4. **Conclusion**:
- Since the reason does not specifically explain why restriction enzymes recognize these sequences (it merely describes what palindromic sequences are), we conclude that the assertion is true, the reason is true, but the reason is not the correct explanation for the assertion.

5. **Selecting the Correct Option**:
- Based on the evaluation, the correct option is:
- **Option B**: Both assertion and reason are true, but the reason is not the correct explanation for the assertion.