Utilize the input text as a context reference, choose the right relationship between Lehman Brothers and investment bank 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.

A decade later, US investment bank Lehman Brothers filed for bankruptcy (15 September, 2008) setting off a panic that threatened the entire global financial system.

Answer: product_or_material_produced