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.
Refer to the input text as context and select the correct relationship between 'Bharat Petroleum' and 'Petroleum' from the available options.
Options: legal form, distribution format, product/material produced, publisher