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': 'Longest acting insulin \nSelect and explain. \nA. Degludec, B. Aspa, C. Regular insulin, D. Glargine insulin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Degludec is the longest acting insulin.it acts for 42hrs so it can be given even once every alternate day. Other long-acting which acts for 24 hrs is glargine, detemir. They are insulin analogues. Ref: KD Tripathi 8th ed.', 'role': 'assistant'}]