user: Question: who is the featuring when the doctor is the 6th and the series sorted is 6Y/AK?
Columns: ['Series Sorted', 'Title', 'Doctor', 'Featuring', 'Released']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['6EB/A', 'The Elite', '5th', 'Tegan , Nyssa , Dalek', 'October 2011']
SQL:

assistant: SELECT "Featuring" FROM "Table" WHERE "Doctor" = '6th' AND "Series Sorted" = '6Y/AK';