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: March 2007 \nSelect and explain. \nA. Sodium Ion, B. Chlorine Ion, C. Potassium Ion, D. Bicarbonate Ion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Chlorine IonSalivary Amylase break large, insoluble starch molecules into soluble starches (amythrodextrin, achrodestrin and ultimately maltose.Ptyalin acts on linear alpha (1,4) glycosidic linkages.Optimum conditions for ptyalinOptimum pH - 5.6 -6.9Human body temperature-37 degrees CelsiusPresence of ceain anions and activators:- Chlorine and bromine - most effective- Iodine - less effective- Sulfate and phosphate- least effective', 'role': 'assistant'}]