1. A method, in a computing system, for interpreting and distinguishing a laek of an answer to an input question, the method comprising: receiving an input question from a user; generating one or more hypotheses based on a corpus of source information; injecting a no-answer response into the one or more hypotheses to form a plurality of candidate answers; ranking the plurality of candidate answers based on evidence scoring and confidence scoring to form a candidate answer ranking; and responsive to determining the no-answer response is the top candidate answer in the candidate answer ranking, presenting the no-answer response to the user.