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.
Text: Fold in the Silverado's upscale twin, the GMC Sierra, and General Motors ( NYSE:GM ) sold more full-size pickups in the first half of 2015 than mighty Ford ( NYSE:F ) .
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