Analyze the relationship between 'Hindustan Petroleum' and 'Petroleum' within the context of the input sentence.
Options: product/material produced, stock exchange, industry, operator

The Indian companies on the 2015 Fortune Global 500 list are Indian Oil ranked 119 on the list with revenues of about USD 74 billion, Reliance Industries (158) with revenues of USD 62 billion, Tata Motors with revenues of USD 42 billion (254), State Bank of India with revenues of USD 42 billion (260), Bharat Petroleum with revenues of USD 40 billion (280), Hindustan Petroleum with revenues of USD 35 billion and Oil and Natural Gas with with revenues of USD 26 billion (449).
product/material produced