**Core Concept**
RNA (Ribonucleic acid) is a vital molecule involved in various cellular processes, including protein synthesis, regulation of gene expression, and transmission of genetic information. It plays a crucial role in the central dogma of molecular biology, where DNA is transcribed into RNA, which is then translated into proteins.

**Why the Correct Answer is Right**
RNA participates directly in processes like transcription, where it serves as a template for DNA replication and repair, and translation, where it carries amino acid sequences to the ribosome for protein synthesis. However, RNA does not directly participate in DNA replication, which involves the unwinding of double-stranded DNA, the synthesis of new DNA strands, and the repair of damaged DNA.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because RNA indirectly participates in DNA replication through the process of transcription, where RNA primers are synthesized to initiate DNA synthesis.
**Option B:** This option is incorrect because RNA plays a crucial role in the regulation of gene expression through various mechanisms, including RNA interference (RNAi) and microRNA (miRNA) mediated silencing.
**Option C:** This option is incorrect because RNA is involved in the transmission of genetic information from DNA to proteins through the process of translation.

**Clinical Pearl / High-Yield Fact**
RNA is a dynamic molecule that plays a central role in various cellular processes, including protein synthesis, regulation of gene expression, and transmission of genetic information. Understanding the role of RNA is essential for grasping the mechanisms of gene expression and protein synthesis.

**Correct Answer: D. DNA Replication.**