This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
[{'content': "What accounts for this patient's hand pain? \nSelect and explain. \nA. Ulnar artery occlusion, B. Wrist fracture, C. Radial artery thrombosis, D. Carpal tunnel syndrome", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer C. Radial artery thrombosisPeripheral ischemia resulted from interruption of radial artery blood flow at the wrist by a thrombosis.', 'role': 'assistant'}]