Aug 10 (Reuters) - Dean Foods Co's steeper-than-expected decline in quarterly sales and surprise departure of its chairman ahead of the earnings report sent shares of the largest U.S. milk processor down as much as 18 percent on Monday.
Take context from the input text and decide on the accurate relationship between 'Dean Foods' and 'milk' from the options provided.
Options: product/material produced, operator, owned by, owner of