user: Question: What was the type of surface played on for the week of March 17?
Columns: ['Tournament', 'Surface', 'Week', 'Winner and score', 'Finalist', 'Semifinalists']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Indian Wells', 'Hard', 'March 10', 'Michael Chang 4–6, 6–3, 6–4, 6–3', 'Bohdan Ulihrach', 'Jonas Björkman Thomas Muster']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Week" = 'March 17';