1. A method to identify changes in evidence used to answer questions by a question answering system, comprising: identifying a first evidence related to a feature, wherein the question answering system has identified the feature as being relevant to answering a first type of question of a plurality of types of questions; detecting a change in the first evidence determining that a confidence score of a first response generated for a first question, of the first type of question, exceeds a confidence threshold; outputting an indication of the change in the first evidence; and responsive to receiving an approval to update the first response, generating an updated response for the first question.