What is the relationship between 'Tata Steel' and 'steel' in the context of the input sentence.
Options: stock exchange, product/material produced, subsidiary, chairperson

Tata Steel: Tata Steel on Wednesday said production of coke has started at its Kalinganagar project in Odisha and it is set for commissioning of the first phase of its 3 million tonne steel plant.
product/material produced