Utilize the input text as a context reference, choose the right relationship between ConocoPhillips and Petroleum 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.

Last week light oil producer Penn West Petroleum and oil major ConocoPhillips said they were eliminating a combined 900 jobs in Canada.

Answer: product_or_material_produced