This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Secretory Functions of the Alimentary Tract, Subject name: Physiology
[{'content': 'Which ion is more in gastric secretions compared to blood? \nSelect and explain. \nA. Cl-, B. HCO3-, C. K+, D. Na+', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ANSWER: (A) Cl"REF: Harrison 18th ed chapter 45 Na+ (mEq/1)K+ (mEQ/1)Cl- (mEq/1)HCO3- (mEq/1)Gastric juice of low acid70-1405 TO 4040 to 1205 to 25Gastric juice of high acid20 to 305 to 4080 to 1500Blood135 to 1453.5-5.596-10618-22', 'role': 'assistant'}]