question: What book became popular with monks in France and had an effect on how light was used in cathedrals ?
answer: The Celestial Hierarchy
turker_answer: The Celestial Hierarchy became popular with monks in France and had an effect on how light was used in cathedrals .
rule-based: The Celestial Hierarchy became popular with monks in France and had an effect on how light was used in cathedrals .