First of all here is the website to back up what I'm about to say http://nutrition.mcdonalds.com/getnutrition/ingredientslist.pdf
Next I'm going to copy and paste from that website the ingred. from the grilled chicken.
Grilled Chicken Fillet:
Chicken breast fillet with rib meat, water, seasoning (rice starch, salt, sugar, yeast extract, canola oil, onion...