This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
A biopsy of the lower lip salivary glands showed replacement of parenchymal tissue by lymphocytes. The patient also had xerostomia and keratoconjunctivitis sicca. These findings are indicative of which of the following? 
Select and explain. 
A. Lymphoma, B. Crohn’s disease, C. Mumps, D. Sjögren’s syndrome
D: Sjögren’s syndrome
Answer: D: Sjögren’s syndrome 
Explanation: This triad of signs defines primary Sjögren’s syndrome. The patient has secondary Sjögren’s syndrome if rheumatoid arthritis or other autoimmune disease is present