10. The method of claim 1 wherein searching the plain text data from the one plain text knowledge database comprises: generating a query statement based on a mining set of search terms associated with the input question, wherein the query statement is executable to perform a search of the plain text data to generate search results.
10. The method of claim 1 wherein searching the plain text data from the one plain text knowledge database comprises: generating a query statement based on a mining set of search terms associated with the input question, wherein the query statement is executable to perform a search of the plain text data to generate search results. 11. The method of claim 10 further comprising iteratively refining the search by broadening or narrowing search criteria until a number of the search results meets a pre-specified threshold.