user: Question: Which grid is constructed by Maserati and driven by Oscar Alfredo Gálvez?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Alberto Ascari', 'Ferrari', '97', '3:01:04.6', '1']
SQL:

assistant: SELECT "Grid" FROM "Table" WHERE "Constructor" = 'Maserati' AND "Driver" = 'Oscar Alfredo Gálvez';