**Core Concept**
Neuroglial cells, also known as glial cells, are non-neuronal cells that provide support and protection to neurons in the central nervous system (CNS). There are several types of neuroglial cells, including astrocytes, oligodendrocytes, ependymal cells, and microglia.

**Why the Correct Answer is Right**
Neuroglial cells play crucial roles in maintaining the health and function of neurons. Astrocytes are involved in the regulation of the extracellular environment, oligodendrocytes produce myelin, ependymal cells line the ventricles and central canal, and microglia act as the immune cells of the CNS. The correct answer will be the option that does not belong to this category.

**Why Each Wrong Option is Incorrect**
* **Option A:** Astrocytes are a type of neuroglial cell that provides support and protection to neurons.
* **Option B:** Oligodendrocytes are responsible for producing myelin, which is essential for neuronal function and is a type of neuroglial cell.
* **Option C:** Microglia are the immune cells of the CNS and are a type of neuroglial cell.

**Clinical Pearl / High-Yield Fact**
Astrocytes play a crucial role in the regulation of the extracellular environment, including the maintenance of ion and water balance, and the removal of excess neurotransmitters.

**Correct Answer: B. Oligodendrocytes are responsible for producing myelin in the PNS, not the CNS.**