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
Which is more in stimulated saliva as compared to unstimulated saliva? 
Select and explain. 
A. CI, B. K, C. Hydrogen, D. HCO3
D: HCO3
Answer: D: HCO3 
Explanation: None