Take context from the input text and decide on the accurate relationship between 'SABMiller' and 'beer' from the options provided.
Options: stock exchange, product/material produced, chairperson, platform

The joint venture began in 2004, and was reconfigured in 2008 for a 10-year term as the companies sought to counter the dominance in the region of SABMiller Plc, which controls more than 90 percent of the South African beer market.
product/material produced