Utilize the input text as a context reference, choose the right relationship between 'Tata Steel' and 'steel' from the options.
Options: subsidiary, product/material produced, chairperson, stock exchange

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