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.
Utilize the input text as a context reference, choose the right relationship between 'Hindustan Petroleum' and 'Petroleum' from the options.
Options: product/material produced, owned by, currency, manufacturer