Question: Ten little Niggers, in American reprints and adaptations were all retitled "And Then There Were None", after the last five words in the nursery rhyme that has a roud folk song index number of what?
Sentence (from "And Then There Were None"): It was first published in the United Kingdom by the Collins Crime Club on 6 November 1939, as Ten Little Niggers, after the British blackface song, which serves as a major plot point.
Relevant evidence: Yes