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
Salivary secretion is by 
Select and explain. 
A. Na+, Cl reabsorption, B. Na+, K secretion, C. Na+, K+ reabsorption, D. Cl–, HCO3– secretion
A: Na+, Cl reabsorption
Answer: A: Na+, Cl reabsorption 
Explanation: Salivary secretion is by Na+, Cl– reabsorption  and K+, HCO3– secretion.