Given the question: Timothy Guy Phelps - Timothy Guy Phelps (December 20 1824 June 11 1899) was an American business executive and politician. He was the first president of the Southern Pacific Railroad from 1865 until 1868 when the railroad was purchased by members of The Big Four and saw the railroad build its first tracks south of San Francisco California. 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?
The answer is:
Office Holder