In the context of the input sentence, determine the relationship between 'Alcoa' and 'aluminium'.
Options: parent organization, subsidiary, product/material produced, developer

Alcoa (NYSE: AA - news ) rose 2.98% after the aluminium giant unveiled plans to split into two separate companies, while Kellogg (Hamburg: 944624.HM - news ) slid 0.66% after saying it would buy Egypt-based Mass Food Group in a deal worth approximately $150m.
product/material produced