单选题 Which outcome would indicate successful treatment of diabetes insipidus?
A. Fluid intake of less than 2,500 mL in 24 hours.
B. Urine output of more than 200 mL/hour.
C. Blood pressure of 90/50 mmHg.
D. Pulse rate of 126 beats/minute.

【正确答案】 A

【答案解析】Diabetes insipidus is characterized by polyuria (up to 8 L/day), constant thirst, and an unusually high oral intake of fluids. Treatment with the appropriate drug should decrease urine output and oral fluid intake.