user: ### NOW ANSWER:
Question: What is School, when Event is "100 backstroke"?
Columns: ['Event', 'Time', 'Swimmer', 'School', 'Year']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['50 freestyle', '19.83', 'Nick Schuttinger', 'Oklahoma Baptist University', 2013.0]
SQL:

assistant: SELECT "School" FROM "Table" WHERE "Event" = '100 backstroke';