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': 'Non-noxious stimulus is perceived as pain in \nSelect and explain. \nA. Allodynia, B. Hyperalgesia, C. Paraesthesia, D. Hyperpathia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Allodynia refers to central pain sensitization (increased response of neurons) following normally non-painful, often repetitive, stimulation. Allodynia can lead to the triggering of a pain response from stimuli which do not normally provoke pain. Ref Harrison20th edition pg 2345', 'role': 'assistant'}]