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: Dental
[{'content': 'Hall mark signs of neuropathic pain are mechanical hyperalgesia and \nSelect and explain. \nA. Allodynia, B. Alopecia, C. Allocretia, D. Allogeusia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]