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
Which of following is true about allodynia? 
Select and explain. 
A. Hyperalgesia, B. Loss of sensory sensations, C. Perception of non painful stimulus as pain, D. Hyperaesthesia
C: Perception of non painful stimulus as pain
Answer: C: Perception of non painful stimulus as pain 
Explanation: *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