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: Pathology
[{'content': 'Hypovolemic shock develops after loss of \nSelect and explain. \nA. 10% blood, B. 20% blood, C. 30% blood, D. 40% blood', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]