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: Pharmacology
Esomeprazole acts by inhibiting 
Select and explain. 
A. H+Na+ ATPase pump, B. H+ pump, C. H+K+ ATPase pump, D. Any of the above
C: H+K+ ATPase pump
Answer: C: H+K+ ATPase pump 
Explanation: Esomeprazole is an example of proton pumb inhibitor