user: Question: What is Tournament, when Result is 18th?
Columns: ['Year', 'Tournament', 'Venue', 'Result', 'Extra']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2000.0, 'World Junior Championships', 'Santiago , Chile', '7th', 'Heptathlon']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Result" = '18th';