12. The computer program product of claim 10 , wherein the candidate answer comprises a wrapper having context information for the candidate answer, and wherein the validator operates on the context information in the wrapper of the candidate answer to determine if the one or more criteria of the validator are satisfied.
13. The computer program product of claim 12 , wherein the wrapper comprises a confidence measure metric for the candidate answer, a rank of the candidate answer, and one or more identifiers of supporting evidence passages that provide support for the candidate answer being a correct answer for the input question.