Task: Text Categorization
Input (English): Question: What is allodynia ?: 
 Options:  <0> Painful sensation triggered by non-painful stimuli. <1> Abnormal sensation, but not painful. <2> Sensation in which the patient has a high threshold of stimulation. <3> Tingling or numbness <4> Painful sensation increased in front of a painful stimulus.
Output (English): pharmacology