Table: argentinagp_1971_2
Columns: race_name
circuit
date
winning_driver
constructor
report

Question: Who is the constructor of John Surtees's Oulton Park circuit car?
SQL: SELECT "constructor" FROM argentinagp_1971_2 WHERE "circuit" = 'oulton park' AND "winning_driver" = 'john surtees'

Question: Which race was Matra the constructor?
SQL: SELECT "race_name" FROM argentinagp_1971_2 WHERE "constructor" = 'matra'

Question: Which race was at Hockenheim circuit?
SQL: SELECT "race_name" FROM argentinagp_1971_2 WHERE "circuit" = 'hockenheim'

Question: Who was the winner of the XII Spring Trophy race with BRM as the constructor?
SQL: SELECT "winning_driver" FROM argentinagp_1971_2 WHERE "constructor" = 'brm' AND "race_name" = 'xii spring trophy'