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
[{'content': 'Thiazides and loop diuretics both have opposite action on which of the following ions ? \nSelect and explain. \nA. Sodium, B. Potassium, C. Calcium, D. Chloride', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is'c'i.e., Calcium(Ref: KDT 7/e p. 5S2l)Furosemide action on calciumFurosemide increases Ca2+ excretion (contrast thiazides which reduce it)", 'role': 'assistant'}]