user: Question: What is the Surface of the match played on October 5, 1987?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', 'May 3, 1982', 'Perugia', 'Clay', 'Yvonne Vermaak', 'Billie Jean King Ilana Kloss', '2–6, 6–4, 7–6']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Date" = 'October 5, 1987';