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_53103 ( "Race" text, "Circuit" text, "Date" text, "Pole position" text, "Fastest lap" text, "Winning driver" text, "Constructor" text, "Tyre" text, "Report" text )

### Question ###
What was the constructor when Jack Brabham was the driver at the Monaco Grand Prix?

### Accurate SQL ###

SELECT "Constructor" FROM table_53103 WHERE "Winning driver" = 'jack brabham' AND "Race" = 'monaco grand prix'