Answer based on context:

In week 5, the Lions hosted the defending Super Bowl Champion Pittsburgh Steelers. The Lions scored first with a 46-yard Jason Hanson field goal. The Steelers responded with a 7-yard TD run by Rashard Mendenhall. The Lions replied with another 46-yard field goal. In the second quarter, Pittsburgh scored first with a 15-yard TD catch by Heath Miller from Ben Roethlisberger. The Lions retaliated with a 38-yard interception run for a touchdown by William James. Hines Ward of the Steelers next got a touchdown of his own, a 17-yard catch, making the halftime score 21-13 Pittsburgh. After the break, Mike Wallace of Pittsburgh caught a 47-yard TD pass. The final score of the game was a 25-yard catch by Detroit's Dennis Northcutt. Lions backup QB Daunte Culpepper was sacked 7 times in the loss, 3 of which were on consecutive downs.

How many receiving touchdowns did the Detroit Lions have?
1