Q:William Joseph Bill Johnston (born 11 August 1962) is an Australian politician. He has been a Labor Party member of the Western Australian Legislative Assembly since the 2008 state election representing Cannington.As a young man Bill spent time abroad as an AFS Exchange Student to Bandung Indonesia and has kept close ties to Indonesia and its people. In his personal life Bill is married to Kate Doust The Member for the South Metropolitan Region. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Office Holder