After a road loss to the Dolphins, the Patriots returned home for a Week 15 matchup with the Houston Texans.  In the first quarter, New England started off strong with Faulk scoring on an 11-yard touchdown run.  Afterwards, Gostkowski nailed a 36-yard field goal, while Brady completed a 43-yard touchdown pass to Faulk.  In the second quarter, the Patriots' domination of the game continued with Gostkowski kicking a 32-yard field goal, while Brady completed a six-yard touchdown pass to wide receiver Jabar Gaffney.  In the third quarter, the Texans finally managed to get a touchdown with running back Ron Dayne getting in on a one-yard run.  The Patriots responded with  cornerback Ellis Hobbs returning a kickoff 93 yards for a touchdown.  In the fourth quarter, New England wrapped up the game with Gostkowski kicking 31-yard and 21-yard field goals.  With the win, the Patriots improved to 10-4.
Question: How many field goals did Gostkowski score in the fourth quarter?
Answer: 2