prompt: What author became famous for his six-volume biography of Lincoln?
chosen.content: What author became famous for his six-volume biography of Lincoln?
chosen.role: user
chosen.content: The author who became famous for his six-volume biography of Lincoln was Carl Sandburg.
chosen.role: assistant
rejected.content: What author became famous for his six-volume biography of Lincoln?
rejected.role: user
rejected.content: William Henry Herndon
rejected.role: assistant