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.

The factory which expects to start production this month, will be competing with other Tanzanian cement producers including Tanzania Portland Cement, owned by a subsidiary of Germany's Heidelberg Cement AG; Tanga Cement, majority owned by Afrisam Mauritius Investment Holdings Limited; and Mbeya Cement, owned by France's Lafarge SA.

Answer: product_or_material_produced