**Core Concept:** Baholin's duct is a duct in the human body that is part of the salivary gland system. It is a component of the parotid gland and plays a role in the secretion of saliva.

**Why the Correct Answer is Right:** Baholin's duct, or the major parotid duct, is a part of the parotid gland system. It connects the parotid gland to the oral cavity and helps in the secretion of saliva, which is crucial for maintaining oral health and hydration. The correct answer, **C**, represents the opening of Baholin's duct into the major salivary gland, which is the major salivary gland.

**Why Each Wrong Option is Incorrect:**

A. **Option A:** Opening into the minor salivary glands is incorrect as Baholin's duct specifically connects to the major salivary gland, not the minor ones.
B. **Option B:** Opening into the submandibular gland is not correct, as Baholin's duct connects to the major salivary gland, not the submandibular gland.
D. **Option D:** Opening into the oral cavity is partially correct, but Baholin's duct specifically opens into the major salivary gland, not just the oral cavity.

**Clinical Pearl:** Understanding the anatomy and function of Baholin's duct is essential for understanding salivary gland physiology and maintaining oral health. The correct answer, **C**, highlights the importance of the major salivary glands in general, and the role of Baholin's duct in specifically transporting saliva to the oral cavity, contributing to oral hygiene and digestion.