This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Which of the following is an intermediate-acting insulin \nSelect and explain. \nA. Lispro, B. Regular insulin, C. NPH insulin, D. Glargine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: NPH and protamine insulin are intermediate-acting insulins REF KD Tripathi 8th ed.', 'role': 'assistant'}]