Take context from the input text and decide on the accurate relationship between 'Volvo' and 'truck' from the options provided.
Options: publisher, product/material produced, industry, brand

And as Kai noted earlier, Daimler and Volvo have their own JV, just wondering if there's a concern that on this commercial truck hydrogen market, the OEMs might go in-house on some of the components related to hydrogen.
product/material produced