user: Question: when was it announced that the viewers selected Robi out of Alex, Ejay, Nan, Robi?
Columns: ['Task No.', 'Day announced', 'Options', "Viewers' selection", 'Result']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Day 43 (May 4, 2008)', 'Alex, Ejay, Josef, Nan, and Robi', 'Josef', 'Completed']
SQL:

assistant: SELECT "Day announced" FROM "Table" WHERE "Viewers' selection" = 'Robi' AND "Options" = 'Alex, Ejay, Nan, Robi';