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 25-year-old man is brought to the emergency department after sustaining a stab wound to the lower back. Examination shows right leg weakness in all muscle groups and loss of vibration and proprioception on the same side. There is loss of pain and temperature sensation but preserved motor strength in the left leg. He has no problems with bladder or bowel retention. Motor strength is preserved in the upper extremities. \nHis presentation is most consistent with which one of the following spinal cord syndromes? \nSelect and explain. \nA. Anterior cord syndrome, B. Cauda equina syndrome, C. Central cord syndrome, D. Hemisection of the cord', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]