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': 'After an injury to an axon, the subsequent degeneration of all axonal fibres distal to the injury, all fibres proximal to the injury are unaffected, this type of degeneration is known as: \nSelect and explain. \nA. Retrograde degeneration., B. Wallerian degeneration., C. Transneuronal degeneration., D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]