Norsk Hydro (LSE: NHY.L - news ) shares rose 2.8 percent, the top gainer in the pan-European FTSEurofirst 300 index, after the aluminium maker posted second-quarter operating earnings above expectations in spite of weaker metal prices.
Utilize the input text as a context reference, choose the right relationship between 'Norsk Hydro' and 'aluminium' from the options.
Options: distributed by, product/material produced, operator, owned by