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': 'Severe pain after injury or sectioning of a peripheral sensory nerve is called: \nSelect and explain. \nA. Complex regional pain syndrome., B. Neuralgia., C. Neuritis., D. Temporal arteritis.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Causalgia manifests as severe pain after injury or sectioning of a peripheral sensory nerve following a difficult extraction. The other names are complex regional pain syndrome and reflex sympathetic dystrophy syndrome.', 'role': 'assistant'}]