Take context from the input text and decide on the accurate relationship between 'Alcoa' and 'aluminium' from the options provided.
Options: developer, product/material produced, parent organization, subsidiary

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