Take context from the input text and decide on the accurate relationship between 'brewing' and 'beer' from the options provided.
Options: legal form, product/material produced, business division, operator

Founder Christian Ettinger was a business student at the University of Oregon when he first began brewing beer in the early 1990s and remembers when craft or specialty beer consisted of the Killian’s Irish Red, Coors Winterfest and Henry Weinhard’s Dark, Red or Ale.
product/material produced