user: Question: Hossein Ojaghi participated in what semifinal.
Columns: ['Athlete', 'Event', 'Round of 16', 'Quarterfinal', 'Semifinal', 'Final']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Alireza Saadat', '52 kg', 'Chulhang L 0–2', 'Did not advance', 'Did not advance', 'Did not advance']
SQL:

assistant: SELECT "Semifinal" FROM "Table" WHERE "Athlete" = 'Hossein Ojaghi';