Analyze the relationship between 'Fonterra' and 'milk' within the context of the input sentence.
Options: member of, owned by, industry, product/material produced

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