A sialography is an X-ray of which body part?

A sialography specifically refers to an imaging technique that involves taking X-ray images of the salivary glands and ducts. This procedure helps in diagnosing conditions affecting these glands, such as blockages, inflammation, or tumors. The term "sialography" is derived from "sialo," which refers to saliva or salivary glands, and "graphy," indicating a recording or imaging process.

In contrast, the other options—thyroid gland, pancreas, and adrenal glands—refer to entirely different organs that would require different imaging techniques for evaluation and are not associated with sialography. Each of those organs has its own specialized imaging modalities. For instance, thyroid imaging often employs ultrasound or nuclear medicine, while imaging of the pancreas may involve CT scans or MRIs. The specificity of sialography to salivary glands is what makes it the correct answer.