## **Core Concept**
Sialoliths, also known as salivary gland stones, are calcifications within the salivary glands or their ducts. They can cause obstruction of salivary flow, leading to pain and swelling, particularly during meals. The formation of sialoliths is more common in certain salivary glands due to their anatomy and saliva composition.

## **Why the Correct Answer is Right**
The submandibular gland (Option C) is the most common site for sialoliths, accounting for about 80-90% of all cases. This is because the submandibular gland produces a more alkaline and calcium-rich saliva, which favors the formation of stones. Additionally, the duct of the submandibular gland (Wharton's duct) has a longer and more tortuous course, which may contribute to the higher incidence of stone formation.

## **Why Each Wrong Option is Incorrect**
- **Option A:** The parotid gland is less commonly involved in sialolithiasis compared to the submandibular gland, likely due to the lower calcium content of its saliva and the straighter course of its duct (Stensen's duct).
- **Option B:** The sublingual gland is rarely involved in sialolithiasis. It produces a small amount of saliva with a high concentration of mucins but a low calcium content, making stone formation less likely.
- **Option D:** The minor salivary glands are not typically associated with sialolithiasis. While stones can theoretically form in any salivary gland, the minor glands are much less commonly involved.

## **Clinical Pearl / High-Yield Fact**
A key clinical point to remember is that sialoliths are more common in the submandibular gland, and patients often present with pain and swelling in the submandibular area, especially during meals. A useful mnemonic is that sialoliths are more likely to occur in glands with **"C"**haracteristics: calcium-rich saliva and **"C"**urved ducts.

## **Correct Answer:** C. Submandibular gland.