Task: Question Answering
Input (English): Knowledge Base Question Answering (KBQA) systems answer questions by obtaining information from KB tuples BIBREF0 , BIBREF1 , BIBREF2 , BIBREF3 , BIBREF4 , BIBREF5 . 
 Question: What is te core component for KBQA?
Output (English): answer questions by obtaining information from KB tuples