**Core Concept**
In genetics, the coding region is the part of the gene that encodes the amino acid sequence of a protein. Regions away from the coding region are non-coding, and they can have various functions, such as regulating gene expression or providing structural support to the gene.

**Why the Correct Answer is Right**
The correct answer refers to the non-coding regions of a gene, such as introns, intergenic regions, and regulatory elements like promoters and enhancers. These regions do not encode amino acid sequences but instead play crucial roles in controlling gene expression, including transcription initiation, splicing, and translation. For example, the promoter region is essential for recruiting RNA polymerase and other transcription factors to initiate transcription.

**Why Each Wrong Option is Incorrect**
* **Option A:** is incorrect because introns are non-coding regions within the coding region of a gene, specifically within the exons. They are removed during RNA splicing.
* **Option B:** is incorrect because the exons are the coding regions of a gene that are retained in the mature RNA molecule and encode amino acid sequences.
* **Option C:** is incorrect because the regulatory elements, such as promoters and enhancers, are non-coding regions that control gene expression but are not situated away from the coding region.

**Clinical Pearl / High-Yield Fact**
Understanding the distinction between coding and non-coding regions is essential for understanding gene regulation and expression, which is critical in fields like cancer genetics, genetic disorders, and gene therapy.

**Correct Answer:** C. Regulatory elements.