**Core Concept**
The facial nerve, also known as cranial nerve VII, is a complex nerve that supplies multiple structures in the face, including glands, muscles, and sensory areas. It is responsible for controlling facial expressions, taste, and the transmission of sensory information from the face.

**Why the Correct Answer is Right**
The facial nerve supplies the submandibular gland, the sublingual gland, and the lacrimal gland. These glands are responsible for the production of saliva and tears. The facial nerve's branches, including the chorda tympani and the greater petrosal nerve, provide parasympathetic innervation to these glands, which is essential for their function. This parasympathetic innervation is mediated by the neurotransmitter acetylcholine, which stimulates the glands to produce more secretions.

**Why Each Wrong Option is Incorrect**
* **Option A:** The submandibular gland is indeed supplied by the facial nerve, making this option incorrect.
* **Option B:** The sublingual gland is also supplied by the facial nerve, making this option incorrect.
* **Option C:** The lacrimal gland is supplied by the facial nerve, making this option incorrect.

**Clinical Pearl / High-Yield Fact**
The facial nerve's role in controlling facial expressions and transmitting sensory information makes it a crucial structure for diagnosing and treating conditions such as Bell's palsy and facial paralysis.

**Correct Answer: D.**