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Multiple Choice Question 1. Which TWO of the following are correct postoperatively? A. Oxygen therapy may be required for several days. B. Parenteral nutrition should be administered if patients are unable to eat. C. Heparin should always be given to prevent venous thromboembolism. D. Central venous catheters should be removed. E. Early warning scores may alert ward to staff to a deterioration in status of a patient.