Utilize the input text as a context reference, choose the right relationship between Lafarge and cement 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.

CREDAI alleges that companies including UltraTech and Lafarge unilaterally raised cement prices in the last one month.

Answer: product_or_material_produced