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': 'Which of the following is long acting insulin? \nSelect and explain. \nA. Insulin Lispro, B. Insulin Aspart, C. Insulin Glargine, D. Insulin Glulisine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]