user: Question: WHAT IS THE EPISODE NUMBER  THAT HAS 28 DVD?
Columns: ['Release Title', 'Series', 'No. of DVDs', 'No. of Blu-ray Discs', 'Release Date', 'Episode No.', 'Region No.', 'Released by']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['The Complete Collection', '1-11', '28', 'N/A', 'March 30, 2009', '1-61', 2.0, 'ITV Studios']
SQL:

assistant: SELECT "Episode No." FROM "Table" WHERE "No. of DVDs" = '28';