A : Kornberg enzyme is asscoitated with the removal of primers and thymine dimer.
R: DNA polymersase I does exonuclease activity in `5 to 3` and `3 to 5` directions.

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Kornberg enzyme is associated with the removal of primers and thymine dimer."
- The Kornberg enzyme refers to DNA polymerase I, which is indeed responsible for removing RNA primers during DNA replication and also plays a role in repairing thymine dimers.
- Therefore, this assertion is **true**.

2. **Understanding the Reason**: The reason states that "DNA polymerase I does exonuclease activity in 5' to 3' and 3' to 5' directions."
- DNA polymerase I has exonuclease activity that allows it to remove nucleotides. It can perform this activity in the 5' to 3' direction, which is involved in replacing RNA primers with DNA.
- However, it does not have exonuclease activity in the 3' to 5' direction. Therefore, this statement is **false**.

3. **Conclusion**: Since the assertion is true and the reason is false, the correct answer is that the assertion is true, but the reason is false.

### Final Answer:
- The assertion is true, and the reason is false. Therefore, the answer is option C.

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