This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Effect of Thiazides on calcium \nSelect and explain. \nA. Increase excretion, B. Decrease excretion, C. Counterregulatory, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Thiazides spare calcium by inhibiting their excretion.Ref: Goodman Gilman 12/e p 678', 'role': 'assistant'}]