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: Medicine
[{'content': 'The insulin indicated in diabetic ketoacidosis is: \nSelect and explain. \nA. Lento insulin s.c., B. Solubile insulin s.c., C. Protamin zinc insulin i.m., D. Soluble insulin I.V. infusion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]