**Core Concept**
DNA polymerase plays a crucial role in maintaining genome stability by participating in various DNA repair mechanisms. In mammalian cells, multiple DNA polymerases contribute to different types of repair processes, including base excision repair, nucleotide excision repair, mismatch repair, and post-replicative repair.

**Why the Correct Answer is Right**
The correct DNA polymerases involved in mammalian DNA repair are pol β (beta), pol λ (lambda), and pol μ (mu). These enzymes are responsible for synthesizing new DNA strands during the repair process. Pol β is primarily involved in base excision repair, while pol λ and pol μ participate in nucleotide excision repair and other repair pathways. The specific functions of these polymerases enable the accurate restoration of damaged DNA, thereby maintaining genome integrity.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a DNA polymerase involved in mammalian DNA repair. While DNA polymerase I is an essential enzyme in prokaryotic DNA replication, it is not directly involved in mammalian DNA repair.

**Option B:** This option is incorrect because DNA polymerase α (alpha) is primarily involved in initiating DNA replication by synthesizing short RNA primers, rather than participating in DNA repair.

**Option C:** This option is incorrect because DNA polymerase δ (delta) is a processive enzyme involved in leading strand synthesis during DNA replication, rather than participating in DNA repair.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that DNA polymerases involved in repair processes have distinct substrate specificities and catalytic properties, allowing them to accurately restore damaged DNA regions. Understanding the specific roles of pol β, pol λ, and pol μ in mammalian DNA repair is crucial for grasping the complex mechanisms of genome maintenance.

**Correct Answer:** A. pol β, pol λ, and pol μ.