This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
[{'content': 'Shanti has been diagnosed to have brain tumor. You would prefer to give her betamethasone/dexamethasonc over hydrocoisonc 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: (Ref: KDT 6/e p285) Triamcinolone, betamethasone, dexamethasone and paramethasone are selective glucocoicoids (have zero mineralocoicoid action). These are preferred for cerebral edema because they lack salt and water retaining potential (mineralocoicoid action).', 'role': 'assistant'}]