question: Why did President Levin believe there were so many Yale alumni presidential candidates ?
answer: Yale 's focus on creating `` a laboratory for future leaders , ''
turker_answer: President Levin believed there were so many Yale alumni presidential candidates due to Yale 's focus on creating `` a laboratory for future leaders . ''
rule-based: President Levin believed there were so many Yale alumni presidential candidates because of Yale 's focus on creating `` a laboratory for future leaders , .