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': 'Which of following is true about allodynia? \nSelect and explain. \nA. Hyperalgesia, B. Loss of sensory sensations, C. Perception of non painful stimulus as pain, D. Hyperaesthesia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: *Allodynia describes the situation in which a non painful stimulus ,once perceived ,is experienced as painful ,even excruciating . 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 2245', 'role': 'assistant'}]