What is the single immediate management?

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65years man had a bowel resection 5days ago. He is anuric and breathless. His BP=150/110mmHg.He has lung bases and sacral edema. Bloods: K+=6.8mmol/l, urea=58mmol/l, creatinine=600umol/l.

What is the single immediate management?
A . Bolus of 20U insulin
B . 5% dextrose infusion
C . Calcium resonium enema
D . 10U insulin, 50ml of 50% dextrose infusion
E . Dextrose-saline infusion

Answer: D