Take context from the input text and decide on the accurate relationship between 'Starbucks' and 'coffee' from the options provided.
Options: chairperson, distributed by, product/material produced, publisher

Starbucks (Swiss: SBUX.SW - news ) , the world's biggest coffee chain, said on Tuesday it had no plans to enter Iran, while Coca-Cola said it was too early to comment.
product/material produced