Both Marathon Petroleum and Phillips 66 were the downstream arms spun off from their parents in 2011 — Houston-based Marathon Oil Corp. (NYSE: MRO) and Houston-based ConocoPhillips (NYSE: COP).
Utilize the input text as a context reference, choose the right relationship between 'ConocoPhillips' and 'Petroleum' from the options.
Options: manufacturer, product/material produced, creator, founded by