Analyze the relationship between 'Talisman Energy' and 'Petroleum' within the context of the input sentence.
Options: operator, product/material produced, chief executive officer, original broadcaster

He then moved to Clyde Petroleum where he was managing director, then to Paladin Resources as chief executive until its acquisition by Talisman Energy (EUREX: 23554.EX - news ) in 2005.
product/material produced