Table: monaco_1950_grand_prix
Columns: driver
entrant
constructor
chassis
engine
tyre

Question: Who is the driver when the tyre is p and the entrant is officine alfieri maserati?
SQL: SELECT "driver" FROM monaco_1950_grand_prix WHERE "tyre" = 'p' AND "entrant" = 'officine alfieri maserati'

Question: Who is the constructor when the chassis is talbot-lago t26c and the driver is charles pozzi?
SQL: SELECT "constructor" FROM monaco_1950_grand_prix WHERE "chassis" = 'talbot-lago t26c' AND "driver" = 'charles pozzi'

Question: What is the tyre when the entrant is sa alfa romeo and the driver is luigi fagioli?
SQL: SELECT "tyre" FROM monaco_1950_grand_prix WHERE "entrant" = 'sa alfa romeo' AND "driver" = 'luigi fagioli'

Question: Who is the entrant when the engine is talbot l6 and the driver is pierre levegh?
SQL: SELECT "entrant" FROM monaco_1950_grand_prix WHERE "engine" = 'talbot l6' AND "driver" = 'pierre levegh'

Question: Who is the entrant when the chassis is ferrari 125?
SQL: SELECT "entrant" FROM monaco_1950_grand_prix WHERE "chassis" = 'ferrari 125'

Question: what is the engine when the tyre is d, the constructor is era and the driver is bob gerard?
SQL: SELECT "engine" FROM monaco_1950_grand_prix WHERE "tyre" = 'd' AND "constructor" = 'era' AND "driver" = 'bob gerard'