Refer to the input text as context and select the correct relationship between 'Fonterra' and 'milk' from the available options.
Options: director/manager, legal form, stock exchange, product/material produced

Whole milk powder prices fell to a six-year low at auction overnight, prompting ASB and ANZ to cut their forecasts for Fonterra Cooperative Group’s milk payout to farmers in the 2015-16 season.
product/material produced