system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
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:
assistant
The correct answer is  (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).