user: Question:  who is the writer where viewers is 5.16m
Columns: ['#', 'Episode', 'Director', 'Writer', 'Original airdate', 'Viewers']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Episode 1"', 'Martin Hutchings', 'Tony Jordan', '8May2007', '5.46m']
SQL:

assistant: SELECT "Writer" FROM "Table" WHERE "Viewers" = '5.16m';