user: Question: What are the lowest points for the engines of the Lamborghini V12 and the Chassis on Minardi M191B?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1990.0, 'BMS Scuderia Italia', 'Dallara F190', 'Cosworth V8', 0.0]
SQL:

assistant: SELECT MIN("Points") FROM "Table" WHERE "Engine" = 'Lamborghini V12' AND "Chassis" = 'Minardi M191B';