It is helpful to understand what the government allows in feed or to be used in conventional production: Dairy cows - antibiotics, pig & chicken byproducts, hormones (for growth), pesticides,...
I answered this question for a radio game show one time. I believe the top five at the time were McDonalds, Burger King, KFC, Wendy's and Subway. They may not be in the correct order, but these were...
They use the usual, same products you can get at any grocery store. These include ketchup, mustard, mayo, lettuce, onions, pickles, etc.That is correct if you are asking what comes with a meal from a...