response: Well because of it has so many steel-related businesses, it's known as The Steel City.  It's also known for all of it's bridges, 446 in total!
original_response: The Steel City is Pittsburgh's nickname due to its once bustling steel industry. The city is also one of many bridges, 446 bridges as of today!
history: Do you know about pittsburgh Yes I do!  It's located in Allegheny County, Pennsylvania, USA. Yes your right, it has junction of 3 rivers Oh?  Did you know that Pittsburgh has a pre-revolutionary fortification?  And 2 inclined railways!  There's also Point State Park which is at a confluence of rivers. Wow very cool.  Any idea of the population? Yeah, in 2017 it was at 305,704.  That makes it the 63rd largest American city. Oh okay, I thought it was bigger than that.  What's the city known for?
knowledge: Located at the confluence of the Allegheny, Monongahela, and Ohio rivers, Pittsburgh is known as both ''the Steel City'' for its more than 300 steel-related businesses, and as the ''City of Bridges'' for its 446 bridges.