Question: What nationality is the person who hosts Sunrise with David Koh?

full_context: Document 1: Samantha Fox: Samantha Karen Fox (born 15 April 1966) is an English singer, songwriter, actress and former glamour model. In 1983, at age 16, she began appearing as a topless model on Page 3 of British tabloid newspaper "The Sun", and continued as a Page 3 girl until 1986. During this time, she became the most popular pin-up girl of her era, as well as one of the most photographed British women of the 1980s.
Document 2: Sunrise (TV program): Sunrise is an Australian breakfast television program, broadcast on the Seven Network and currently hosted by David Koch and Samantha Armytage. The program follows "Seven Early News" and runs from 5:30 am to 9:15 am, followed by "The Morning Show".
Document 3: Samantha Gillison: Samantha Gillison is an expatriate Australian writer who frequently contributes to Salon.com and Condé Nast Traveler.
Document 4: Samantha Armytage: Samantha Armytage (born 4 September 1976) is an Australian journalist and television news presenter.
Document 5: Good Morning Australia (1992–2005): Good Morning Australia (or GMA), also known as GMA With Bert Newton, was a popular long running morning Australia morning television program hosted by Bert Newton on Network Ten. The program typically featured interviews with celebrities, live music, lifestyle segments and paid advertorials.
Document 6: Samantha Nutt: Samantha Joan Nutt, CM, OOnt, FRCPC, CCFP (born October 1969), is founder and Executive Director of War Child Canada. She is a physician with more than sixteen years of experience working in war zones. Her 2011 book "Damned Nations: Greed, Guns, Armies and Aid" details her work over the course of fifteen years in some of the most devastated regions of the world.
Document 7: CBS News Sunday Morning: CBS News Sunday Morning is an American newsmagazine television program that has aired on CBS since January 28, 1979. Created by Robert Northshield and original host Charles Kuralt, the 90-minute program currently airs Sundays from 9:00 to 10:30 a.m. Eastern, Pacific Time from 7:00 to 8:30 a.m. and 8:00 to 9:30 a.m. in all other time zones (live in the Eastern and Central time zones, and on tape delay elsewhere). The show is hosted by Jane Pauley, who succeeded Charles Osgood on October 9, 2016. Osgood was the host for twenty-two years, taking over from Kuralt in April 1994. Substitute host is Lee Cowan.
Document 8: Studio 10: Studio 10 is an Australian morning talk show on Network Ten. The show is presented by Ita Buttrose, Joe Hildebrand, Sarah Harris, Jessica Rowe and Denise Drysdale. The show airs between 8:30 am and 12:00 pm on weekdays and a highlights show airs between 8:30 am and 11:00 am on weekends.
Document 9: Samantha Stosur: Samantha Jane "Sam" Stosur ( ; born 30 March 1984) is an Australian professional tennis player. She is a former world No. 1 in doubles, a ranking which she held for 61 weeks, and a former world No. 4 in singles.
Document 10: Samata (fashion designer): Samata, also known as Samata Pattinson, is a fashion entrepreneur, director, producer and presenter. The British-born Ghanaian fashion designer, author and journalist is also best known for her role as Global Campaign Director for "Suzy Amis Cameron's" Red Carpet Green Dress campaign showcasing ethical fashion on the Oscars red carpet. Samata has written for Guardian, "Vogue" and "Huffington Post", covering sustainable fashion. She is an award-winning womenswear designer whose work in the fields of fashion and sustainability have received coverage from BBC Radio 1Xtra, "Essence", ITV's "This Morning," E! Entertainment, Women’s Wear Daily, ELLE, InStyle, Essence, Refinery 29 and Red Magazine.
Document 11: David Koch (television presenter): David James Koch ( ; born 7 March 1956), nicknamed "Kochie" ( ), is an Australian television presenter best known as a host of the Seven Network's breakfast program "Sunrise". From Adelaide, he began his media career as a financial journalist, writing for a number of different publications before eventually transitioning to television. Koch has been the current chairman of the Port Adelaide Football Club, an Australian Football League (AFL) club, since October 2012.
Document 12: Denise (TV program): Denise was an Australian morning show television series that aired on the Seven Network from 1998 until 2001. It was hosted by Denise Drysdale.
Document 13: Leigh Sales: Leigh Peta Sales (born 10 May 1973) is an Australian author and journalist. She is the host of the Australian television channel ABC's flagship news and current affairs program "7.30".
Document 14: @Seven: At Seven, commonly stylised as @Seven, was a New Zealand comedy show where Petra Bagust and other comedians present the "real news" from the last 24 hours from New Zealand and the rest of the world. The show replaced "Campbell Live", a New Zealand current-affairs program for the Summer Holidays in 2009/2010 whilst "Campbell Live" took a break. "@Seven" finished for the 2009/2010 summer holiday break on 22 January 2010 and was replaced with the normal TV3 7pm show, "Campbell Live". "@Seven" did not return the following summer break instead TV3 screened re-runs of "Modern Family".
Document 15: Jonathan Samuels: Jonathan Samuels (born 1972) is a British broadcaster and journalist. He is currently the co-anchor on Sky News Sunrise since 17 October 2016. Previously he has held a range of different Senior correspondent posts for "Sky News", the 24-hour television news service operated by Sky Television, part of Sky plc. He was based in Sydney from 2011 to 2014.
ground_truth: Australian