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': 'Which insulin is never mixed with other insulins ? \nSelect and explain. \nA. Lente, B. Aspart, C. Lispro, D. Glargine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]