Name the class when position is rt
{'header': ['Position', 'Number', 'Name', 'Height', 'Weight', 'Class', 'Hometown', 'Games↑'], 'page_title': '2008 Kentucky Wildcats football team', 'page_id': '', 'types': ['text', 'real', 'text', 'text', 'text', 'text', 'text', 'real'], 'id': '1-14624447-39', 'section_title': 'Arkansas', 'caption': 'Arkansas', 'rows': [['LE', '99', 'Jeremy Jarmon', '6\'3"', '277lb.', 'Jr.', 'Collierville, Tennessee', '6'], ['LT', '98', 'Myron Pryor', '6\'1"', '310lb.', 'Sr.', 'Louisville, Kentucky', '6'], ['RT', '91', 'Corey Peters', '6\'3"', '290lb.', 'Jr.', 'Louisville, Kentucky', '6'], ['RE', '95', 'Ventrell Jenkins', '6\'2"', '285lb.', 'Sr.', 'Columbia, South Carolina', '6'], ['OLB', '56', 'Braxton Kelley', '6\'0"', '230lb.', 'Sr.', 'LaGrange, Georgia', '6'], ['MLB', '4', 'Micah Johnson', '6\'2"', '250lb.', 'Jr.', 'Fort Campbell, Kentucky', '4'], ['SLB', '51', 'Johnny Williams', '6\'3"', '244lb.', 'Sr.', 'Jacksonville, Florida', '6'], ['RCB', '32', 'Trevard Lindley', '6\'0"', '175lb.', 'Jr.', 'Hiram, Georgia', '6'], ['LCB', '7', 'David Jones', '5\'10"', '180lb.', 'Sr.', 'Red Jacket, West Virginia', '6'], ['FS', '10', 'Matt Lentz', '6\'3"', '203lb.', 'Rs-Fr.', 'Simpsonville, South Carolina', '2']], 'name': 'table_14624447_39'}