user: Question: What is the elevator when the elector is Pietro Colonna?
Columns: ['Elector', 'Place of birth', 'Cardinalatial title', 'Elevated', 'Elevator']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Hugh Aycelin , O.P.', 'Billom , France', 'Bishop of Ostia e Velletri', 'May 16, 1288', 'Nicholas IV']
SQL:

assistant: SELECT "Elevator" FROM "Table" WHERE "Elector" = 'Pietro Colonna';