**Core Concept**
The parotid gland is a major salivary gland located in the preauricular area, playing a crucial role in the digestion process by secreting saliva rich in enzymes that facilitate carbohydrate digestion. The parotid gland is also a site for the development of certain types of tumors, particularly benign and malignant neoplasms.

**Why the Correct Answer is Right**
The correct answer is related to the innervation of the parotid gland, which is primarily controlled by the parasympathetic nervous system. The parasympathetic fibers originate from the glossopharyngeal nerve (cranial nerve IX) and synapse in the otic ganglion, which then sends postganglionic fibers to the parotid gland. This parasympathetic stimulation leads to an increase in saliva secretion. The parotid gland also receives sympathetic innervation from the superior cervical ganglion, which inhibits saliva secretion.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct innervation of the parotid gland.
**Option B:** This option is incorrect because it is a statement about the submandibular gland, not the parotid gland.
**Option C:** This option is incorrect because it is a statement about the sublingual gland, which has a different innervation pattern.

**Clinical Pearl / High-Yield Fact**
The parotid gland is a common site for the development of pleomorphic adenomas, which are benign salivary gland tumors that can cause facial nerve paralysis if they grow large enough to compress the nerve.

**Correct Answer: A. The parotid gland receives its parasympathetic innervation from the glossopharyngeal nerve via the otic ganglion.**