1. A computer program product to reduce an amount of processing required to generate a response to a first case by a question answering system, the computer program product comprising: a non-transitory computer-readable storage medium having computer-readable program code embodied therewith, the computer-readable program code comprising: computer-readable program code configured to determine that a similarity score, of the first case relative to a second case, exceeds a similarity threshold; computer-readable program code configured to identify a first feature of the second case having a first relevance score exceeding a relevance threshold, wherein the relevance score indicates that the first feature is relevant in generating a correct response to the second case; computer-readable program code configured to determine, based on the similarity score and the first relevance score, that the first feature is relevant in generating a correct response to the first case; computer-readable program code configured to identify a first candidate answer for the first case that does not have the first feature; and computer-readable program code configured to refrain from analyzing the first candidate answer in generating the response to the first case, thereby reducing the amount of processing of the question answering system.