Take context from the input text and decide on the accurate relationship between 'Talisman Energy' and 'Petroleum' from the options provided.
Options: product/material produced, operator, original broadcaster, chief executive officer

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