Utilize the input text as a context reference, choose the right relationship between GMC and General Motors 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.

However, the race is much tighter when you combine both trucks under the General Motors umbrella, the Chevy Silverado and GMC Sierra.

Answer: parent_organization