Utilize the input text as a context reference, choose the right relationship between 'Fonterra' and 'milk' from the options.
Options: product/material produced, brand, headquarters location, subsidiary

Having dominated the commodity milk powder sector for years, Fonterra is aiming to deliver more food services and specialised ingredients in China, its biggest market, and in other emerging countries where it expects demand for dairy products will grow in the long term.
product/material produced