Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_21570 ( "Fin. Pos" real, "Car No." real, "Driver" text, "Team" text, "Laps" real, "Time/Retired" text, "Grid" real, "Laps Led" real, "Points" text )

### Question ###
What is the car number for driver H lio Castroneves

### Accurate SQL ###

SELECT MIN("Car No.") FROM table_21570 WHERE "Driver" = 'Hélio Castroneves'