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: Medicine
[{'content': 'A person comes into your ER room with a very weak pulse after a suffering a heart attack. You suspect: \nSelect and explain. \nA. The weak pulse has nothing to do with shock or the heart attack, so send him home., B. A late stage (decompensated) shock, the least life-threatening stage of shock., C. A very early stage (compensated) shock, the most life-threatening stage of shock., D. A late stage (decompensated) shock, the most life-threatening stage of shock', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D:\xa0\xa0A very weak pulse shows that the heart is slowly ceasing to function as a result of pumping too hard.\nA:\xa0The patient should not be sent home; close observation is necessary.\nB:\xa0This stage is a life-threatening stage as the heart could tire itself out and stop functioning.\nC:\xa0An early stage of shock shows a rapid, bounding pulse.', 'role': 'assistant'}]