FILE – This Tuesday, Jan. 21, 2014, file photo showsa McDonald’s Big Mac sandwich at a McDonald’s restaurant in Robinson Township, Pa. The worlds biggest hamburger chain is confronting unappetizing questions as part of a U.S. campaign to beat back perceptions that it serves Frankenfood. The company has run similar campaigns in Canada and Australia and said Monday, Oct. 13, 2014, its bringing the effort to its flagship market. (AP Photo/Gene J. Puskar, File)
