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
[{'content': 'Salivary gland function in Sjogren syndrome patients is measured by: \nSelect and explain. \nA. Salivary flow rate., B. Minor salivary gland biopsy., C. Salivary scintigraphy., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]