This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Raised ICP and Brain death, Subject name: Medicine
[{'content': 'Most effective way of reducing ICP? \nSelect and explain. \nA. Osmotherapy, B. vasopressors, C. Ventriculostomy, D. Elective ventilation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Most effective way of reducing ICP: Ventriculostomy Fully automated process in which ICP monitor catheter is placed in left horn of ventricle and when sensor detects ICP more than 25mmHg, one way valve opens and CSF flows into sterile container. Osmotherapy: IV mannitol, IV saline 3% and IV Acetazolamide. Vasopressors: Nor-epinephrine and Dopamine. Elective ventilation: Least effective method.', 'role': 'assistant'}]