This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pain Physiology, Subject name: Physiology
Light touch on a patient's face causes sever pain. This is best described as? 
Select and explain. 
A. Paresthesia, B. Allodynia, C. Dysesthesia, D. Peripheral neuropathy
B: Allodynia
Answer: B: Allodynia 
Explanation: ANSWER: (B) AllodyniaREF: Ganong 22nd ed chapter 7, Classification of chronic pain IASP Task Force on Taxonomy by H. Merskey and N. Bogduk 2nd ed pp 209-214Indirect repeat Physiology 2013 Session 2See previous question