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: Physiology
[{'content': 'Predominant ion in saliva is \nSelect and explain. \nA. Potassium, B. Sodium, C. Bicarbonate, D. Chloride', 'role': 'user'}, {'content': 'Answer: C \nExplanation: During saliva production, K+\xa0and Hco3- are secreated of which Hco3-\xa0>>\xa0 K+ secreted.', 'role': 'assistant'}]