1. A method for using user preferences to customize answer output comprising: extracting, by a natural language processor computer, from a first question, one or more preferences for a first user; extracting, by the natural language processor computer, from the first question, one or more sentiment levels for the first user; performing by a computer a semantic search on the first question; receiving by a computer from the semantic search, a first plurality of candidate answers to the first question; score, using the preferences and the sentiment levels extracted from the first question, each candidate answer to the first question; selecting by a computer one or more of the received candidate answer to the first question according to each corresponding score; outputting by a computer to the first user, via a user interface device, the selected one or more candidate answers to the first question, wherein the first user interface device comprises an output device selected from the group of a display, a printout, and a speaker; extracting, by the natural language processor computer, from a second question, one or more preferences for the first user; extracting, by the natural language processor computer, from the second question, one or more sentiment levels for the first user; accumulating the preferences extracted from the second question, the sentiment levels extracted from the second question, and the preferences extracted from the first question, and the sentiment levels extracted from the first question, to form a set of accumulated preferences and sentiment levels; performing by a computer a second semantic search on the second question; receiving from the second semantic search a plurality of candidate answers to the second question; scoring by a computer, using the set of accumulated preferences and sentiment levels, each candidate answer to the second question; selecting by a computer one or more of the received candidate answers to the second question according to each corresponding score; outputting by a computer, to the first user, via a user interface device, the selected one or more candidate answers to the second question, wherein the user interface device comprises an output device selected from the group consisting of a display, a printout, and a speaker.