user: Question: which is the production code when the number of the episode in series is 87? 
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'U.S. viewers (millions)', 'Original U.S. air date', 'Prod. code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [80.0, 1.0, '"Alex Tells the World"', 'Victor Gonzalez', 'Gigi McCreery & Perry Rein', '4.1', 'November12,2010', '401']
SQL:

assistant: SELECT "Prod. code" FROM "Table" WHERE "No. in series" = 87.0;