B. Thoughtful (foaled 1975 in California) was an American Thoroughbred racemare. Raced by Swiss businessman Walter Haefner and trained by future U.S. Racing Hall of Fame inductee Robert Wheeler she won eight stakes races including the Oak Leaf Stakes and Hollywood Oaks.The B. Thoughtful Stakes a race for California bred fillies and mares run annually at Hollywood Park Racetrack was named in her honor. 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:
Animal