context: In week 4, the Lions traveled across Lake Michigan to Green Bay, Wisconsin to play division rivals the Green Bay Packers. The Packers started the scoring in the first quarter with a 29-yard TD catch by Donald Driver from Aaron Rodgers. The Lions tied it up in the second quarter with a 23-yard TD catch by Calvin Johnson. The Packers took the lead with a 13-yard catch by Jermichael Finley. They added to their lead 17-yard catch by Greg Jennings. The Lions responded just before halftime with a 21-yard catch by Calvin Johnson. Just after the break, the Packers' Charles Woodson returned an interception for a touchdown. The Lions attempted a comeback with 4 consecutive field goals: from 39 yards and 52 yards in the 3rd quarter, and later from 49 yards and 24 yards in the 4th. With the loss, not only did the Lions fall to 0-4, but it also marked their 19th consecutive loss in Wisconsin.
question: How many touchdowns were scored in the first half?
answer: 5