This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
Which one of the following is the description used for the term allodynia? 
Select and explain. 
A. Absence of pain perception, B. Complete lack of pain sensation, C. Unpleasant sensation with or without a stimulus, D. Perception of an ordinarily non noxious stimulus as severe pain
D: Perception of an ordinarily non noxious stimulus as severe pain
Answer: D: Perception of an ordinarily non noxious stimulus as severe pain 
Explanation: 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: Ganong&;s review of medical physiology, 23rd edition, Page no:168