**Core Concept**
The question is testing knowledge of the cranial sutures, which are fibrous joints that connect the bones of the skull. The parietal and occipital bones are two of the eight bones that make up the cranial vault, and they are joined by a specific suture.

**Why the Correct Answer is Right**
The suture present between the parietal and occipital bones is called the **Parieto-Occipital Suture**. This suture is a fibrous joint that allows for growth and flexibility of the skull during development. The parietal bones are located on the sides and top of the skull, while the occipital bone is located at the back of the skull.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the Coronal Suture is located between the frontal and parietal bones.
**Option B:** This option is incorrect because the Lambdoid Suture is located between the occipital bone and the parietal bones, but it is not a single suture, rather a complex intersection of multiple sutures.
**Option C:** This option is incorrect because the Metopic Suture is a rare suture that is located between the two halves of the frontal bone.

**Clinical Pearl / High-Yield Fact**
It's worth noting that cranial sutures are not visible in adults after the age of 25, as they are gradually replaced by bone throughout life. This is a useful fact to remember when evaluating radiographs or CT scans of the skull.

**Correct Answer:** D. Parieto-Occipital Suture