Utilize the input text as a context reference, choose the right relationship between 'GMC' and 'truck' from the options.
Options: location of formation, stock exchange, product/material produced, headquarters location

The ongoing success of the Chevrolet Silverado and GMC Sierra helped drive the ATP increase; full-size pickup truck ATPs were up $230 month over month and more than $1,000 year over year.
product/material produced