Conversation so far:
What happened in the 2015 season?
Roethlisberger signed a five-year contract extension with the Steelers.
Why did he sign an extension?
CANNOTANSWER.
How did the 5 years go?
Roethlisberger went 26 for 38 for 351 yards, one touchdown pass and one interception during a 28-21 loss against the Patriots to kick off the 2015.

Question: Did they win the season?
Self-contained rewrite: Did the Steelers win the season in 2015?