Orthophytum grossiorum is a species of the genus Orthophytum. This species is endemic to Brazil. 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?
Plant

Laelaptiella is a genus of mites in the family Ologamasidae. 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?
Animal

John Patrick O'Brien (February 1 1873 – September 21 1951) was an Irish-American politician who served as the 98th Mayor of New York City from January 1 to December 31 1933. 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?
Office Holder