user: Question: WHAT COMPETITION HAS Marian Sandu?
Columns: ['Opponent', 'Res.', 'Class', 'Score', 'Date', 'Competition', 'Notes']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Win', 'Lázaro Rivas', '54kg', '8:0', '2000-06-09', '2000 Summer Olympics', 'Won second Olympic gold medal.']
SQL:

assistant: SELECT "Competition" FROM "Table" WHERE "Res." = 'Marian Sandu';