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
Predominant ion in saliva is 
Select and explain. 
A. Potassium, B. Sodium, C. Bicarbonate, D. Chloride
C: Bicarbonate
Answer: C: Bicarbonate 
Explanation: During saliva production, K+ and Hco3- are secreated of which Hco3- >>  K+ secreted.