Q.query(query string) -> category string -- return the matched 
		category for any user query

def query(self, query):
		"""Q.query(query string) -> category string -- return the matched 
		category for any user query
		"""
		self.query = query
		self.process_query()
		matching_corpus_index = self.match_query_to_corpus()
		return self.category_list[matching_corpus_index].strip()