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': 'Shock is a circulatory disturbance characterized by \nSelect and explain. \nA. Increased blood pressure, B. Decreased volume of circulating blood, C. Elevated body temperature, D. Decreased volume of interstitial fluid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]