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 glucocorticoids is - \nSelect and explain. \nA. Prednisone, B. Prednisolone, C. Cortisone, D. Dexamethasone', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Dexamethasone Relative Activity of systemic corticosteroids", 'role': 'assistant'}]