question: Who is thought to have led to calling Tucson ` The Old Pueblo ' ?
answer: Mayor R. N. `` Bob '' Leatherwood
turker_answer: Mayor R. N. `` Bob '' Leatherwood is thought to have led to calling Tucson ` The Old Pueblo ' .
rule-based: Mayor R. N. `` Bob '' Leatherwood is thought to have led to calling Tucson ` The Old Pueblo ' .