Table: donohue_race_results
Columns: year
chassis
engine
start
finish
entrant

Question: What is the start of Offy engine and in 1972?
SQL: SELECT "start" FROM donohue_race_results WHERE "engine" = 'offy' AND "year" = 1972

Question: What is the chassis for offy engine and 25th finish?
SQL: SELECT "chassis" FROM donohue_race_results WHERE "engine" = 'offy' AND "finish" = '25th'

Question: What is the finish of Mclaren chassis?
SQL: SELECT "finish" FROM donohue_race_results WHERE "chassis" = 'mclaren'