Question: Which band was formed first, Dinosaur Jr. or Poster Children?

Context paragraphs:
Tool of the Man: Tool of the Man is the fourth album by American alternative rock band Poster Children, released in 1993.  The title of the album comes from graffiti written in dust on the band's van during the South by Southwest Festival: "Poster Children, Band of the Year, Tool of the Man".  The album art consists of several optical illusions, including an afterimage of the United States flag on the front cover.

Feel the Pain: "Feel the Pain" is a single by alternative rock band Dinosaur Jr. from their 1994 album "Without a Sound".  When interviewed by Billboard magazine the producer and mixer for Dinosaur Jr., Agnello, explained that he was after a "dry" sound to the song, "…so dry it jumps out at you."  Despite bashing "Without a Sound" as a whole, "Feel the Pain" was one of the two songs (the other being "I Don't Think So") that music critic Stephen Thomas Erlewine felt was a success.  The music video was directed by Spike Jonze.

Absinthe Blind: Absinthe Blind was an American Shoegaze and Dream pop group from Urbana, Illinois.  The first group was formed by brothers Seth and Adam Fein and Tristan Wraight in 1996, by merging Adam Fein's group (coincidentally also called Absinthe Blind) and Tristan Wraight and Seth Fein's The Dr. Johanson Band.  Dr. Johanson Band bassist Mike Zolfo was then asked to join the group.  As the Champaign-Urbana music scene gained national attention, due to groups such as Hum and Poster Children, Absinthe Blind, along with three other groups, formed a collective entitled Toast Music.  The brothers' younger sister, Erin Fein joined the band during the recording of "Music for Security" while she continued to study sociology and political science at the University of Illinois.  In support of Music For Security, the band embarked on a national tour, performing at The CMJ Music Marathon along the way.  For their fourth album, The Everyday Separation, the band signed to Mud Records, distributed by Parasol.  Zolfo left the group in 2002 to attend music school, and was replaced by Brett Sanderson.  The group released one more album, Rings, in 2003, before Adam Fein announced that he was leaving the band.  A farewell tour followed, culminating with a hometown show at the Canopy Club in Urbana, Illinois on September 13, 2003.

Without a Sound: Without a Sound is the sixth studio album by alternative rock band Dinosaur Jr., released on August 23, 1994.  It is the first Dinosaur Jr. album not to feature Murph on drums, who is replaced by vocalist and guitarist J Mascis.  It is also their most commercially successful album, peaking at number 44 on the Billboard Top 200. " Feel the Pain" and "I Don't Think So" were released as singles, with "Feel the Pain" reaching number 4 on the Billboard Modern Rock Tracks chart, becoming one of their biggest hits.  Mascis later admitted that his father's death affected his writing and performance on this album, and he took three years to deliver the next Dinosaur Jr.  LP, 1997's "Hand It Over".

Dinosaur (album): Dinosaur is the debut studio album by the alternative rock band Dinosaur Jr. It was released in 1985 on Homestead Records.  The album exhibits a folkier side of the band than on future releases , but some of the tracks on the album showed off a much heavier, more hardcore punk-based side to the band in songs such as "Does it Float", "Mountain Man", and "Bulbs of Passion".

Poster Children: Poster Children is an American indie rock band formed at the University of Illinois at Champaign-Urbana in 1987.  They have issued eleven studio albums.  Known for their strong DIY ethic, the band members continue to drive their own tour bus, create their own artwork and T-shirt designs, and operate their own record label.  Poster Children were also pioneers in several forms of electronic technology relating to performance art, including enhanced CDs, webcasts, and blogs.

Leader Cheetah: Leader Cheetah are an Australian indie rock band from Adelaide, South Australia, formed in 2007 by members of defunct Adelaide bands Pharaohs and Bad Girls of the Bible.  The band have toured nationally and appeared at festivals such as Splendour in the Grass, Big Day Out, St Jerome's Laneway Festival and Come Together.  The group released its debut studio album, "The Sunspot Letters", in 2009, followed by their second album, "Lotus Skies", in 2011.  The group have also toured alongside such high-profile international acts as Interpol, Dinosaur Jr. and Dan Auerbach, Blitzen Trapper and Elbow.

Dinosaur Jr.: Dinosaur Jr. is an American rock band formed in Amherst, Massachusetts, in 1984, originally simply called Dinosaur until legal issues forced a change in name.

Mexican Pets: Mexican Pets were formed by Pat Clafferty and Jill Hahn in Dublin, Ireland in 1990 inspired by American bands such as Hüsker Dü and Dinosaur Jr.  The two soon drafted Derrick Dalton in on bass whose distinct and accomplished style was an invaluable contribution to the band's sound.  The band never featured a permanent drummer and a string of players graced the stool including two guys called Eric, both of them American.  Having made several demo recordings and playing extensive gigs around the country, they had their first break up.  Each of its members pursued other musical interests until the spring of 1994 when they reformed.  In that same year they found a permanent drummer in Fionan O Leary.  Jill Hahn then moved to Manchester, replaced by Brian Gough on other guitar and organ.  They recorded their first album "Nobody's Working Title" on Independent Records that summer and continued to play across the country.

National Skyline: National Skyline is an American alternative rock band formed in late 1996 by Jeff Dimpsey of Hum.  Dimpsey originally formed the band in order to perform a 45-minute-long song that he had written.  They were initially an indie rock supergroup of sorts, with a rotating cast of prominent Champaign/Chicago area musicians.  They did record the 45-minute song/album with Rick Valentin (of The Poster Children) in spring 1997, but it has never been released.  The band's name is apparently a reference to Bob Dylan's album "Nashville Skyline", though their music betrays no stylistic debt to Dylan.

Supporting paragraphs: Dinosaur Jr. Poster Children
Answer: Dinosaur Jr.