An 18-year-old man with cystic fibrosis was referred to clinic. Over recent months his lung function had deteriorated an

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An 18-year-old man with cystic fibrosis was referred to clinic. Over recent months his lung function had deteriorated and he had lost weight. He was being treated for a chest infection at the time of the consultation.Investigations:oral glucose tolerance test (75 g):fasting plasma glucose8.2 mmol/L (3.06.0)2-h plasma glucose13.5 mmol/L (<7.8)What is the most appropriate management?

A. repeat oral glucose tolerance test after chest infection has resolved
B. restrict refined carbohydrate intake
C. start gliclazide
D. start insulin E. start sitagliptin