question: On what date did Francis Crick announce to an audience of pub-goers that he had discovered DNA ?
answer: 28 February 1953
turker_answer: Francis Crick announced to an audience of pub-goers that he had discovered DNA on 28 February , 1953 .
rule-based: Francis Crick announced to an audience of pub-goers that he had discovered DNA on 28 February 1953 .