user: Question: In what rounDs DiD the P15 Chassis anD tyre D participate?
Columns: ['Entrant', 'Constructor', 'Chassis', 'Engine', 'Tyre', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Ecurie Belge', 'Talbot-Lago', 'T26C', 'Talbot 23CV 4.5 L6', 'D', 'Johnny Claes', '1, 3–8']
SQL:

assistant: SELECT "Rounds" FROM "Table" WHERE "Tyre" = 'D' AND "Chassis" = 'P15';