Question: Which region did this son of Marion Kozak and British politician who was Leader of the Labour Party and Leader of the Opposition in the 2010s, represent as Member of Parliament in 2005?
Related documents: [0]  [DOC] Marion Kozak or Marion Kozak Miliband (born 1934 as Dobra Jenta Kozak, also known as Maria Kozak) is a Polish-born British activist. She emigrated to the United Kingdom in the 1950s. In 1961 she married Ralph Miliband (1924–1994) and their two sons, David Miliband and Ed Miliband, have risen to prominence in modern-day British politics. [END] 
[1]  [DOC] Edward Samuel Miliband (born 24 December 1969) is a British politician who was Leader of the Labour Party as well as Leader of the Opposition between 2010 and 2015. He became the Member of Parliament (MP) for Doncaster North in 2005, being re-elected in 2010, 2015, and 2017, and served in the Cabinet from 2007-10 under Prime Minister Gordon Brown. [END] 
Answer: 
Doncaster North
Doncaster North