**Core Concept**
The question is testing the knowledge of the diagnostic investigation used to identify stones in the salivary gland. Sialoscopy, also known as sialography, is a radiographic examination of the salivary gland using a contrast agent, typically a water-soluble dye.

**Why the Correct Answer is Right**
The correct answer is **sialography**. Sialography involves injecting a water-soluble dye into the salivary gland to visualize the glandular structure and identify any abnormalities, such as stones. The dye is then visualized using X-ray imaging. This diagnostic tool helps to confirm the presence of a stone and guide further treatment.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not specifically relate to the diagnostic investigation of salivary gland stones. While imaging studies like CT or MRI may be used to evaluate the salivary gland, they are not the primary diagnostic tool for identifying stones.
* **Option B:** This option is incorrect as it refers to a procedure used to diagnose and treat parotid gland tumors, not salivary gland stones. Sialendoscopy is a minimally invasive procedure that uses a thin endoscope to visualize the salivary gland and remove blockages or stones.
* **Option C:** This option is incorrect as it is a nonspecific term that refers to any imaging study of the salivary gland, not specifically for identifying stones. While imaging studies may be used to evaluate the salivary gland, they are not the primary diagnostic tool for identifying stones.

**Clinical Pearl / High-Yield Fact**
Sialography is a sensitive diagnostic tool for identifying salivary gland stones, but it should be used judiciously as it may cause temporary inflammation of the gland.

**Correct Answer: B. Sialendoscopy**