Xerostomia is most commonly a symptom of WHAT thyroid dysfunction b salivary gland d autoimmune connective tissue disease?

Xerostomia, or dry mouth, is most commonly a symptom of Sjögren's syndrome, an autoimmune connective tissue disease.

Sjögren's syndrome is characterized by the inflammation and destruction of the exocrine glands, which are responsible for producing saliva and tears. As a result, people with Sjögren's syndrome often experience dry mouth and dry eyes.

While xerostomia can also be a symptom of thyroid dysfunction and salivary gland dysfunction, it is most commonly associated with Sjögren's syndrome.