**Core Concept**
The secretomotor innervation to the parotid gland plays a crucial role in regulating salivation. This innervation is mediated by the autonomic nervous system, specifically the parasympathetic division, which is responsible for stimulating the secretion of saliva.

**Why the Correct Answer is Right**
The secretomotor innervation to the parotid gland relays in the otic ganglion, which receives preganglionic fibers from the glossopharyngeal nerve (cranial nerve IX). These preganglionic fibers synapse with postganglionic neurons in the otic ganglion, which then transmit signals to the parotid gland to stimulate salivation. The release of acetylcholine (ACh) from the postganglionic neurons into the parotid gland's secretory cells activates muscarinic receptors, leading to the secretion of saliva.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the otic ganglion is a specific relay station for the secretomotor innervation of the parotid gland, whereas other ganglia may be involved in the innervation of other salivary glands.
**Option B:** This option is incorrect because the submandibular ganglion is involved in the innervation of the submandibular and sublingual salivary glands, not the parotid gland.
**Option C:** This option is incorrect because the pterygopalatine ganglion is involved in the innervation of the lacrimal gland and the mucous glands of the nasal cavity, not the parotid gland.

**Clinical Pearl / High-Yield Fact**
The otic ganglion is a small, oval-shaped ganglion located near the foramen ovale, and it is a key structure in the parasympathetic innervation of the parotid gland. Damage to this ganglion can result in reduced salivation and xerostomia (dry mouth).

**Correct Answer:** C.