Unsupervised Relation Extraction for Automatic Generation of Multiple-Choice Questions Naveed Afzal author Viktor Pekar author 2009-09 text Proceedings of the International Conference RANLP-2009 Galia Angelova editor Ruslan Mitkov editor Association for Computational Linguistics Borovets, Bulgaria conference publication afzal-pekar-2009-unsupervised https://aclanthology.org/R09-1001/ 2009-09 1 5