In the context of the input sentence, determine the relationship between 'Hindustan Petroleum' and 'Petroleum'.
Options: subsidiary, director/manager, product/material produced, brand

The Hindustan Petroleum Corp (HPCL) scrip fell 7.56%, while Bharat Petroleum Corp (BPCL) and the country’s biggest state-run refiner, Indian Oil Corp (IOC), declined 6-78% each.
product/material produced