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: Medicine
[{'content': 'Longest acting Insulin among the following \nSelect and explain. \nA. Insulin Glargine, B. Insulin Detemir, C. Insulin Degludec, D. NPH', 'role': 'user'}, {'content': 'Answer: C \nExplanation: insulin degludec which has duration of action upto 42hours Ref Harrison 20th edi page no 2863, tab 397-4', 'role': 'assistant'}]