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

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