Utilize the input text as a context reference, choose the right relationship between Kenworth and Truck 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.

Class 8 Used Truck Volumes Flat in July, ACT Research August 27, 2015, 07:00 AM Related: ACT Research , Class 8 , Daimler , Freightliner , Kenworth , Mack , Navistar , Paccar , Peterbilt , Trucks , Used Equipment , Volvo

Answer: product_or_material_produced