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': 'How much loss of circulating body fluid is within normal compensatory mechanism of body \nSelect and explain. \nA. 15% loss, B. 20% loss, C. 30% loss, D. 40% loss', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Further loss of circulating volume overloads the body’s compensatory mechanisms and there is progressive renal, respiratory and cardiovascular decompensation. In general, loss of around 15% of the circulating blood volume is within normal compensatory mechanisms. Blood pressure is usually well maintained and only falls after 30–40% of the circulating volume has been lost.', 'role': 'assistant'}]