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': 'Salivary amylase is activated by \nSelect and explain. \nA. Na+, B. K+, C. HCO3-, D. Cl-', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Both salivary and pancreatic α -amylases are activated by Cl–', 'role': 'assistant'}]