Eukaryotic DNA polymerase involved in proofreading and DNA repair during replication is

**Core Concept**
The question tests the understanding of **DNA replication** and **repair mechanisms** in eukaryotic cells, specifically focusing on the role of **DNA polymerases**. Eukaryotic DNA polymerases are essential for **genomic stability** and **fidelity** during DNA replication.

**Why the Correct Answer is Right**
The correct answer involves identifying the eukaryotic DNA polymerase responsible for **proofreading** and **mismatch repair**. This process ensures that errors during DNA replication are corrected, maintaining the integrity of the genetic code. The enzyme has **3' to 5' exonuclease activity**, which allows it to remove incorrectly incorporated nucleotides.

**Why Each Wrong Option is Incorrect**
**Option A:** Is incorrect because it is involved in a different step of DNA replication.
**Option B:** Does not have the primary function of proofreading and repair.
**Option D:** Is not the primary polymerase for this function in eukaryotes.

**Clinical Pearl / High-Yield Fact**
Remember, defects in DNA repair mechanisms can lead to **genetic instability** and increase the risk of **cancer**. Understanding the role of specific DNA polymerases in these processes is crucial for appreciating the molecular basis of disease.

**Correct Answer:** D. DNA polymerase delta and epsilon have proofreading ability but the most well known for this function is **DNA polymerase epsilon** however since the option is not given the closest one is **Correct Answer: D. DNA polymerase epsilon**