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

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