This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Qukk Reduction of blood pressure is done in - \nSelect and explain. \nA. Cerebral infarct, B. Hypeensive encephalopathy, C. Myocardial infarction, D. Any patient with hypeension', 'role': 'user'}, {'content': 'Answer: B \nExplanation: blood pressure should be lowered rapidly in patients with hypeensive encephalopathy, there are inherent risks of overly aggressive therapy. In hypeensive individuals, the upper and lower limits of autoregulation of cerebral blood flow are shifted to higher levels of aerial pressure, and rapid lowering of blood pressure to below the lower limit of autoregulation may precipitate cerebral ischemia or infarction as a consequence of decreasedcerebral blood flow. Renal and coronary blood flows also may decrease with overly aggressive acute therapy. The initial goal of therapy is to reduce mean aerial blood pressure by no more than 25% within minutes to 2 h or to a blood pressure in the range of 160/100-110 mmHg. This may be accomplished with IV nitroprusside, a sho-acting vasodilator with a rapid onset of action that allows for minute-to-minute control of blood pressure. Parenteral labetalol and nicardipine are also effective agents for the treatment of hypeensive encephalopathy. ref:Harrison&;s principles of internal medicine,ed 18,pg no 2059', 'role': 'assistant'}]