A 60-year-old man is found comatose by his relatives. Paramedics notice on physical examination that he has decreased skin turgor and dry mucous membranes. On arrival at the hospital, laboratory studies show blood glucose of 698 mg/dL, but no ketones in blood. Urine analysis is negative for ketone bodies and protein, but positive for glucose (4+). Which of the following is the most likely diagnosis? a. Islet cell tumor secreting glucagon b. Type 1 diabetes mellitus c. Cushing syndrome d. Ingestion of a large quantity of sugar e. Type 2 diabetes mellitus

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