## **Core Concept**
The question tests knowledge of sialolithiasis, which refers to the formation of stones within the salivary glands. This condition most commonly affects the **submandibular gland** due to its anatomy and the composition of its secretions.

## **Why the Correct Answer is Right**
The submandibular gland is the most common site for salivary gland stones, accounting for about 80-90% of all cases. This is because the submandibular gland has a longer and more tortuous duct (Wharton's duct) with an uphill flow of saliva against gravity, which can facilitate the deposition of calcium salts. Additionally, the submandibular gland produces more **calcium-rich** saliva compared to other salivary glands, increasing the likelihood of stone formation.

## **Why Each Wrong Option is Incorrect**
* **Option A:** The **parotid gland** is less commonly affected by stones, likely due to its serous secretion, which is less prone to calcification, and the straighter course of Stensen's duct, which facilitates easier flow of saliva.
* **Option B:** The **sublingual gland** can form stones but is much less commonly involved compared to the submandibular gland. Its stones are usually smaller and less symptomatic.
* **Option D:** The **minor salivary glands** are rarely involved in sialolithiasis. When stones do form in these glands, they are typically small and cause localized symptoms.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that patients with salivary gland stones often present with **intermittent swelling and pain**, especially during meals. A classic clinical maneuver is to ask the patient to **massage the gland** or stimulate saliva production to assess for pain or swelling, which can help in diagnosing sialolithiasis.

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