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': 'Mineralocoicoid activity of 20 microgram hydrocoisone is equal to? \nSelect and explain. \nA. 5 mg of fludrocoisone, B. 10 mg of fludrocoisone, C. 20 mg of fludrocoisone, D. None', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'None' o Some guides have given 5 mg as the answer. Which is incorrect (See following table).", 'role': 'assistant'}]