Utilize the input text as a context reference, choose the right relationship between Mumias Sugar and sugar 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.

Mumias Sugar and Nzoia and South Nyanza mills have been complaining about sugar poaching.

Answer: product_or_material_produced