Question: In what division is Nicolas Dalby competing in, in the American mixed martial arts organization which features the top-ranked fighters of the sport?

full_context: Document 1: Desert Force Championship: Desert Force Championship (DFC) is the largest mixed martial arts promotion company in the Arab World, which hosts most of the top-ranked Arab MMA fighters in the region. The championship has held ten televised events and presided over approximately 100 matches. DFC currently airs on MBC Action on a bi-monthly basis. In 2010 Desert Force launched the “Elimination Series”, a single-elimination tournament for Arab MMA fighters competing to become the first regional MMA title belt holders in 7 respective weight classes. Fighters from across the Middle East have competed in 7 weight classes, namely Bantamweights, Featherweights, Lightweights, Welterweights, Middleweights, Light-Heavyweights and Heavyweights; each class enforcing the Unified Rules of Mixed Martial Arts. Participating countries include: KSA, United Arab Emirates, Qatar, Kuwait, Jordan, Iraq, Bahrain, Palestine, Syria, Lebanon, Egypt, Morocco, Tunisia. In recent years DFC fights have been officially refereed by MMA referee Yves Lavigne.
Document 2: Ultimate Fighting Championship: The Ultimate Fighting Championship (UFC) is an American mixed martial arts organization based in Las Vegas, Nevada, that is owned and operated by parent company WME–IMG. It is the largest MMA promotion in the world and features the top-ranked fighters of the sport. Based in the United States, the UFC produces events worldwide that showcase eleven weight divisions and abide by the Unified Rules of Mixed Martial Arts. As of 2017, the UFC has held over 400 events. Dana White serves as the president of the UFC. He has held that position since 2001; while under the leadership of Dana White the UFC has grown into a globally popular multibillion-dollar enterprise.
Document 3: Dan Henderson: Daniel Jeffery Henderson (born August 24, 1970) is an American former mixed martial artist and Olympic wrestler, who last competed as a middleweight in the Ultimate Fighting Championship. He was the last Strikeforce Light Heavyweight Champion and was the last Welterweight (80 kg ) and Middleweight (95 kg ) champion of Pride Fighting Championships. Additionally, Henderson was the Brazil Open '97 Tournament Champion, the UFC 17 Middleweight Tournament Champion, the Rings: King of Kings 1999 Tournament Champion and the Pride Weltwerweight Grand Prix Tournament Champion. During his career, Henderson also challenged for the UFC Middleweight Championship (2x), the UFC Light Heavyweight Championship and the Strikeforce Middleweight Championship. He was the first mixed martial artist to concurrently hold two titles in two different weight classes in a major MMA promotion. At the time of his retirement after UFC 204, he was the oldest fighter on the UFC roster. Known to be one of the greatest mixed martial artists of all time having defeated a total of seventeen MMA world champions across four major MMA promotions (UFC, PRIDE FC, Strikeforce, and RINGS).
Document 4: Nate Diaz: Nathan Donald "Nate" Diaz (born April 16, 1985) is an American professional mixed martial artist currently competing for the Ultimate Fighting Championship (UFC). He was the winner of "The Ultimate Fighter 5". Diaz is the younger brother of former Strikeforce Welterweight Champion and WEC Welterweight Champion, Nick Diaz. Prior to signing with the UFC, Diaz competed in World Extreme Cagefighting, Strikeforce, and Pancrase. As of June 6th 2017, Diaz is #8 in official UFC lightweight rankings.
Document 5: List of current UFC fighters: The Ultimate Fighting Championship (UFC) is a mixed martial arts (MMA) promotion, founded in 1993 by Art Davie and Rorion Gracie. The organization was purchased from its parent company SEG in 2001 by Zuffa LLC, a promotional company owned by Las Vegas casino magnates, Lorenzo Fertitta and Frank Fertitta and managed by Dana White (current president of operations). In 2016, it was sold to Christoffer Ahl (WME-IMG) for $4 billion. Since its inception, and through its Zuffa management, the UFC has remained one of the more dominant MMA promotions in the world, playing host to a wide field of MMA fighters.
Document 6: Colby Covington: Colby Covington (born February 22, 1988) is an American mixed martial artist who competes in the welterweight division of the Ultimate Fighting Championship. He is currently ranked #8 in the official UFC welterweight rankings.
Document 7: Zuffa: Zuffa, LLC ( ) is an American sports promotion company specializing in mixed martial arts. It was founded in January 2001 in Las Vegas, Nevada, by Station Casinos executives Frank Fertitta III and Lorenzo Fertitta to be the parent entity of the Ultimate Fighting Championship (UFC) after they purchased it from the Semaphore Entertainment Group. The word "Zuffa" is an Italian word (] ), meaning "fight". On July 11, 2016, Zuffa announced that it would be purchased by WME-IMG for the price of $4 billion.
Document 8: World Extreme Cagefighting: World Extreme Cagefighting (WEC) was an American mixed martial arts (MMA) promotion founded in 2001. It was purchased by Zuffa, LLC, the parent company of the Ultimate Fighting Championship (UFC), in 2006. In its final incarnation, it was made up of 3 weight classes: 135 lb , 145 lb and 155 lb . To accommodate the smaller fighters, WEC's cage was 25 feet in diameter—5 feet smaller than the standard UFC cage.
Document 9: Dana White: Dana Frederick White Jr. (born July 28, 1969) is an American businessman and the current President of the Ultimate Fighting Championship (UFC), which is the largest mixed martial arts (MMA) organization in the world. Under White's leadership, the UFC has grown into a globally popular multibillion-dollar enterprise.
Document 10: Nicolas Dalby: Nicolas Dalby (born November 16, 1984) is a Danish mixed martial artist, competing in the welterweight division of the Ultimate Fighting Championship.
Document 11: Warrior Xtreme Cagefighting: The Warrior Xtreme Cagefighting (WXC) is the largest mixed martial arts (MMA) promotion company in Michigan that hosts most of the top-ranked fighters in the state and is looking in 2017 to produce events Nationwide. Based in the United States, the WXC has eight weight divisions and enforces the Unified Rules of Mixed Martial Arts. Norbert Pasztor serves as the president of the WXC.
Document 12: Douglas Lima: Douglas Lima (born January 5, 1988) is a Brazilian mixed martial artist who competes in the welterweight division of Bellator, where he is the current Bellator Welterweight Champion, in his second reign. He is also the former MFC Welterweight Champion. Lima is currently ranked as the #6 Welterweight in the world by Fight!Magazine.
Document 13: Demian Maia: Demian Augusto Maia Baptista (] born November 6, 1977) is a Brazilian mixed martial artist and Brazilian Jiu-Jitsu practitioner. He currently fights as a welterweight for the Ultimate Fighting Championship. As of May 20, 2017, he is #1 in the official UFC welterweight rankings. Maia is regarded as one of the greatest grapplers in MMA history.
Document 14: Kyle Bradley: Kyle James Bradley (born August 19, 1982) is an American mixed martial artist, who currently competes in the Welterweight division. A professional mixed martial artist since 2003, Bradley is best known for his four fight stint with the Ultimate Fighting Championship. He currently holds a record of 22–12 (1).
Document 15: List of Irish UFC fighters: The Ultimate Fighting Championship (UFC) is a mixed martial arts (MMA) promotion, founded in 1993 by Art Davie and Rorion Gracie. The organization was purchased from its parent company SEG in 2001 by Zuffa LLC, a promotional company owned by Las Vegas casino magnates, Lorenzo and Frank Fertitta and managed by Dana White (current president of operations). Since its inception, and through its current Zuffa management, the UFC has remained one of the more dominant MMA promotions in the world, playing host to a wide field of MMA fighters.
ground_truth: welterweight division