Utilize the input text as a context reference, choose the right relationship between Mattel and doll from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Sales of Mattel Inc.’s doll brand, its biggest product, tumbled 19 percent last quarter, dragging down overall results for the toymaker.

Answer: product_or_material_produced