9. The method of claim 6 , wherein selecting the at least one candidate answer from the updated set of candidate answers comprises: performing synthesis stage, merging and ranking stage, and final answer selecting stage operations of a question and answer (QA) system pipeline on the updated set of candidate answers.
6. The method of claim 1 , wherein selecting at least one candidate answer in the set of candidate answers as an answer for the input question based on the user input comprises: updating the set of candidate answers based on the user input; and selecting the at least one candidate answer from the updated set of candidate answers.