Bert Johnson (Michigan politician) -  Bert Johnson is a Democratic member of the Michigan Senate representing the 2nd district since 2010. During his service as state representative he was Chair of the Detroit Caucus which is composed of the twelve state representatives and five state senators whose districts include a part of the city of Detroit. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Office Holder