State-owned fuel retailers — IOC, Bharat Petroleum Corp (BPCL) and Hindustan Petroleum Corp (HPCL) — revise petrol and diesel prices on 1st and 16th of every month based on average imported cost and rupee-dollar exchange rate in the previous fortnight.
In the context of the input sentence, determine the relationship between 'Hindustan Petroleum' and 'Petroleum'.
Options: product/material produced, founded by, employer, industry