Please answer the following question: Mark McGregor Shelton (born November 8 1956) is a pediatrician at the Cook Children's Medical Center in Fort Worth Texas who is a Republican former member of the Texas House of Representatives.From 2009 to 2013 he represented House District 97 in Tarrant County.Shelton did not seek reelection in 2012 but instead ran a strong but unsuccessful race for the District 10 seat in the Texas State Senate having lost to the Democratic incumbent Wendy R. 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