Coming off their upset road win over the Colts, the Bears flew to Bank of America Stadium for a Week 2 intraconference duel with the Carolina Panthers.  In the first quarter, Chicago struck first as WR Brandon Lloyd returned a blocked punt 9 yards for a touchdown.  In the second quarter, the Bears added onto their lead as kicker Robbie Gould got a 26-yard field goal.  The Panthers would respond with kicker John Kasay getting a 37-yard field goal.  In the third quarter, Chicago added onto its lead with FB Jason McKie getting a 1-yard TD run.  However, Carolina started to rally as Kasay nailed a 45-yard field goal, along with RB Jonathan Stewart getting a 4-yard TD run.  In the fourth quarter, the Panthers closed out its game-winning rally with Stewart getting a 1-yard TD run.
Question: How many yards was the longest touchdown run?
Answer: 4