premise: The sale was made to pay Yukos' US$ 27.5 billion tax bill, Yuganskneftegaz was originally sold for US$ 9.4 billion to a little known company Baikalfinansgroup which was later bought by the Russian state-owned oil company Rosneft .
hypothesis: Yukos was a Russian company.
reason: The statement is in the correct category because the excerpt says that Rosneft was a Russian company, but does not say what country Yukos was from. The system may have had difficulty because the excerpt did not specify what Yukos is or where it was from.