What is what kind of mayonnaise does burger king use?

As an AI language model, I don't have access to Burger King's exact recipe or sourcing information, but it can be assumed that they use a commercially produced mayonnaise that is made to their specifications and standards. It may contain ingredients like soybean oil, egg yolks, vinegar, salt, sugar, and lemon juice, and could be seasoned with various spices and flavorings for a unique taste. Some fast food chains also use reduced-fat or low-calorie mayonnaise options, but it's unclear if Burger King does so.