Task: Question Answering
Input (English): The two main data sets that we will use to evaluate our architecture are the 2014 i2b2 de-identification challenge data set BIBREF2 and the nursing notes corpus BIBREF3 . 
 Question: Which two datasets is the system tested on?
Output (English): 2014 i2b2 de-identification challenge data set BIBREF2 nursing notes corpus BIBREF3