**Core Concept**
The parasympathetic nervous system (PNS) is a branch of the autonomic nervous system that promotes rest and digestion, and is characterized by the presence of **visceral efferent (GVE) fibers**. These fibers are responsible for transmitting motor signals from the central nervous system to various visceral organs.

**Why the Correct Answer is Right**
The PNS is present in certain cranial nerves that have parasympathetic nuclei, including the **oculomotor nerve (III)**, **facial nerve (VII)**, and **glossopharyngeal nerve (IX)**. These nerves contain parasympathetic motor fibers that innervate various organs, such as the ciliary muscles, salivary glands, and parotid glands. However, the **trigeminal nerve (V)** primarily serves as a sensory nerve and does not contain parasympathetic motor fibers.

**Why Each Wrong Option is Incorrect**
**Option A:** The oculomotor nerve (III) contains parasympathetic motor fibers that innervate the ciliary muscles and sphincter pupillae.
**Option B:** The facial nerve (VII) contains parasympathetic motor fibers that innervate the submandibular and sublingual glands.
**Option C:** The glossopharyngeal nerve (IX) contains parasympathetic motor fibers that innervate the parotid gland.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the PNS is responsible for promoting rest and digestion, and its functions are often characterized by the presence of parasympathetic motor fibers in certain cranial nerves.

**Correct Answer:** D. Trigeminal nerve (V)