This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
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, an appropriate drug is: 
Select and explain. 
A. Crystalline zinc insulin, B. NPH insulin, C. Tolbutamide, D. Ultralente insulin
A: Crystalline zinc insulin
Answer: A: Crystalline zinc insulin 
Explanation: None