1. A computer-implemented method comprising: receiving a question, said question being directed to a question answering system; extracting two or more queries from said question; generating two or more question sets, each of said two or more question sets addressing all of said two or more queries; selecting one of said two or more question sets to yield a selected question set, based on analyzing each of said two or more question sets according to a pre-trained model; and presenting said selected question set to said question answering system.