Utilize the input text as a context reference, choose the right relationship between 'Fonterra' and 'milk' from the options.
Options: owned by, member of, product/material produced, industry

Fonterra in August slashed its farmgate milk price for the coming season by $NZ1.40 to $NZ3.85 per kilogram of milk solids but since then prices have risen at three successive GlobalDairyTrade auctions to arrest a six-month slide.
product/material produced