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: Surgery
[{'content': 'Shock is clinically best assessed by - \nSelect and explain. \nA. Urine output, B. CVP, C. BP, D. Hydration', 'role': 'user'}, {'content': 'Answer: A \nExplanation: • Shock: Inadequate delivery of oxygen and nutrients due to poor tissue perfusion\xa0to maintain normal tissue and cellular function\n• Mean arterial pressure <60 mm Hg in previously normotensive patients\n• Systemic vascular resistance rises leading to decreased cutaneous blood flow\xa0and autoregulation is critical in sustaining cerebral and coronary blood flow.', 'role': 'assistant'}]