This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Salivary Glands, Subject name: Pathology
A 45-year-old woman with long-standing rheumatoid ahritis complains of dry eyes and dry mouth. Bilateral enlargement of the parotids is noted on physical examination. The syndrome described here is best described as 
Select and explain. 
A. Autoimmune, B. Infectious, C. Metabolic., D. Metastatic
A: Autoimmune
Answer: A: Autoimmune 
Explanation: Sjogren syndrome Chronic autoimmune disorder Characterized by dry eyes (keratoconjunctivitis sicca) & dry mouth (xerostomia) d/t immunologically mediated lymphocytic infiltration & parenchymal destruction of lacrimal & salivary glands.