question: How important were cotton , silk , indigo dye , saltpetre and tea to the company ?
answer: The company 's mainstay business
turker_answer: Cotton , silk , indigo dye , saltpetre , and tea were important to the company 's mainstay business .
rule-based: Cotton , silk , indigo dye , saltpetre and tea to the company were the company 's mainstay business .