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
Non-noxious stimulus is perceived as pain in 
Select and explain. 
A. Allodynia, B. Hyperalgesia, C. Paraesthesia, D. Hyperpathia
A: Allodynia
Answer: A: Allodynia 
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 Harrison20th edition pg 2345