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
[{'content': 'Normal gastric juice contains all except: \nSelect and explain. \nA. Na+, B. IQ-, C. Ca++, D. Mg+', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Ca++The cells of the gastric glands secrete about 2500 ml of gastric juice dailyQ.', 'role': 'assistant'}]