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': 'Shanti has been diagnosed to have brain tumor. You would prefer to give her betamethasone/dexamethasone over hydrocortisone as steroids to decrease her cerebral edema because: \nSelect and explain. \nA. They do not cause Na+ and water retention, B. They are more potent, C. They can be administered intravenously, D. They inhibit brain tumours', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]