user: Question: What was the entrant in round 16 were Ferrari was the constructor?
Columns: ['Entrant', 'Constructor', 'Chassis', 'Engine', 'Tyre', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Honda Marlboro McLaren', 'McLaren - Honda', 'MP4/6', 'Honda RA121E 3.5 V12', 'G', 'Ayrton Senna', 'All']
SQL:

assistant: SELECT "Entrant" FROM "Table" WHERE "Rounds" = '16' AND "Constructor" = 'Ferrari';