This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Pharmacology
[{'content': 'Which of the following insulin should not be mixed with other insulins? \nSelect and explain. \nA. Glargine, B. Aspa, C. Lispro, D. Regular', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Insulin preparations: Sho acting insulin - Aspa Glulisine Lispro Regular Intermediate acting -> Lente insulin Long acting insulin Detemir Degludec NPH Ultra long acting insulin: Glargine Inhaled insulin - Afrezza All insulin preparation are available at neutral pH. Insulin glargine has acidic pH<4, so insulin glargine should not be mixed with any other insulin.', 'role': 'assistant'}]