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: Pharmacology
[{'content': 'All of the following glucocorticoids lack mineralocorticoid activity, except: \nSelect and explain. \nA. Beclomethasone, B. Triamcinolone, C. Prednisolone, D. Dexamethasone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]