and "Who is the most beautiful woman in the world, Adriana Lima or Jessica Alba?".
we decided to employ a Conditional Random Fields (CRF) tag-ger (Lafferty et al., 2001) to the task, since CRF was shown to be state-of-the-art for sequential relation extraction (Mooney and Bunescu, 2005;Culotta et al., 2006;Jindal and Liu, 2006).