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
[{'content': 'Most important step in management of diabetic ketoacidosis is administration of: \nSelect and explain. \nA. Insulin, B. Intravenous fluids (saline), C. Soda-bicarbonate, D. Potassium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]