## Core Concept
Serous demilunes are crescent-shaped structures composed of serous cells that cover the terminal portions of mucous glands. They play a crucial role in the secretion of enzymes and other substances into the saliva. The presence of serous demilunes is particularly significant in mixed glands, which contain both mucous and serous cells.

## Why the Correct Answer is Right
The correct answer, **C. Submandibular gland**, is right because the submandibular gland is a mixed gland that predominantly contains serous cells but also has a significant mucous component. Serous demilunes are abundant in this gland, allowing for the secretion of a variety of enzymes, including amylase and lysozyme, into the saliva. The submandibular gland's structure, with its numerous serous acini and demilunes, supports its function in producing a substantial amount of serous secretion.

## Why Each Wrong Option is Incorrect
- **Option A:** The parotid gland is primarily a serous gland, meaning it mainly secretes enzymes and has fewer mucous cells. While it does have some serous demilunes, they are not as characteristic or abundant as in mixed glands like the submandibular gland.
- **Option B:** The sublingual gland is a mixed gland but predominantly mucous. It does contain serous demilunes but not to the extent seen in the submandibular gland.
- **Option D:** The minor salivary glands are scattered throughout the oral cavity and are mostly mucous in nature. They do contain some serous cells and demilunes but are not known for having a large number of serous demilunes compared to the submandibular gland.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the submandibular gland, due to its high content of serous cells and demilunes, is responsible for producing a significant portion of the saliva's enzymatic content, including **amylase** and **lysozyme**. This is crucial for the initial digestion of carbohydrates and for the antibacterial properties of saliva.

## Correct Answer: C. Submandibular gland.