Coming off their home win over the Panthers, the Bears flew to Ford Field for a Week 5 Monday Night duel with their NFC North foe, the Detroit Lions.  After a scoreless first quarter, Chicago trailed in the second quarter with Lions quarterback Matthew Stafford completing a 73-yard touchdown pass to wide receiver Calvin Johnson.  The Bears would answer with a 44-yard field goal from kicker Robbie Gould, followed by quarterback Jay Cutler finding tight end Kellen Davis on a 9-yard touchdown pass. Detroit responded in the third quarter with Stafford completing an 18-yard touchdown pass to tight end Brandon Pettigrew, followed by running back Jahvid Best getting an 88-yard touchdown run.  Chicago tried to rally in the fourth quarter with a 49-yard field goal from Gould, but the Lions pulled away with kicker Jason Hanson nailing a 31-yard field goal.
How many yards was the final field goal?
31