Task: Question Answering
Input (English): Question: What is allodynia ?: 
 Options:  <1> Painful sensation triggered by non-painful stimuli. <2> Abnormal sensation, but not painful. <3> Sensation in which the patient has a high threshold of stimulation. <4> Tingling or numbness <5> Painful sensation increased in front of a painful stimulus.
Output (English): 1