user: Question: What is the lowest Preliminary score of a contestant that has an Evening Gown score of 8.472?
Columns: ['State', 'Preliminaries', 'Interview', 'Swimsuit', 'Evening Gown', 'Average']
Types: ['text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Washington', 8.425, 8.933, 8.955, 8.877, 8.921]
SQL:

assistant: SELECT MIN("Preliminaries") FROM "Table" WHERE "Evening Gown" = 8.472;