In 2011, which university got the lowest score in teaching criteria?
in 2011 refers to year 2011; got the lowest score refers to MIN(score), teaching criteria refers to criteria_name = 'Teaching'
SELECT T3.university_name FROM ranking_criteria AS T1 INNER JOIN university_ranking_year AS T2 ON T1.id = T2.ranking_criteria_id INNER JOIN university AS T3 ON T3.id = T2.university_id WHERE T1.criteria_name = 'Teaching' AND T2.year = 2011 ORDER BY T2.score ASC LIMIT 1