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: Pharmacology
[{'content': 'Which of the following drug can be used to treat dry mouth associated with Sjogren syndrome: \nSelect and explain. \nA. Pilocarpine., B. Cevimeline., C. Both, D. None.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]