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: Dental
[{'content': 'Saliva has the following functions, EXCEPT \nSelect and explain. \nA. Defence function, B. Digestive function, C. Absorptive function, D. Lubrication function', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]