user: Question: What Competition has an Event of 4x100 m relay and has the Time of 38.89?
Columns: ['Year', 'Competition', 'Venue', 'Position', 'Event', 'Time']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1983.0, 'World Championships', 'Helsinki', '2nd', '4x100 m relay', '38.37']
SQL:

assistant: SELECT "Competition" FROM "Table" WHERE "Event" = '4x100 m relay' AND "Time" = '38.89';