This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine, Subject name: Pharmacology
[{'content': 'A 15 year old girl with type 1 diabetes is brought to emergency complaining of dizziness. Laboratory findings include severe hyperglycemia, ketoacidosis and blood pH of 7.15. To achieve rapid control of severe ketoacidosis, appropriate drug is: \nSelect and explain. \nA. Crystalline zinc insulin, B. NPH insulin, C. Tolbutamide, D. Ultra lente insulin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Diabetic ketoacidosis must be managed by insulin preparations that can be given by intravenous route. Main insulin given intravenously is Regular insulin . Complication--> Hypoglycemia.', 'role': 'assistant'}]