What is the relationship between 'Starbucks' and 'coffee' in the context of the input sentence.
Options: chief executive officer, product/material produced, position held, distribution format

Sept 24 Starbucks Corp, the world's biggest coffee chain, promised to raise the average wage for its UK staff to just under 8 pounds ($12.18) an hour from November regardless of age, the Financial Times reported.
product/material produced