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.
Take context from the input text and decide on the accurate relationship between 'Norsk Hydro' and 'aluminium' from the options provided.
Options: distributed by, product/material produced, operator, owned by