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Please predict whether this patent is acceptable.PATENT ABSTRACT: A mechanism is provided in a data processing system to improve ground truth in a question answering cognitive system. The mechanism trains a similar passage machine learning model for a similar passage cognitive system using a question and answer key to form a trained similar passage machine learning model. The question and answer key comprises a list of question and answer specification pairs forming a ground truth for the question answering cognitive system. Each question is a text string and each answer specification references one or more text passages from a corpus of information. Responsive to a search event, the mechanism sends at least one text input to the similar passage cognitive system operating in accordance with the trained similar passage machine learning model, wherein the text input comprises a given question text string or a given text passage from the question and answer key, and receives from the similar passage cognitive system a response list of references to text passages from the corpus of information. Responsive to an answer acceptance event for at least one text passage from the response list, the mechanism supplements the question and answer key with the at least one text passage to form a supplemented question and answer key. The mechanism trains a question answering machine learning model of the data processing system using the supplemented question and answer key such that the question answering cognitive system operates in accordance with the trained question answering machine learning model.