McDonald's is continuing to invest heavily in dispelling myths over the quality of its food with another installment in its advertising series intended to instill trust in the brand while helping to maintain its success in the UK market. The ad campaign, developed by Leo Burnett London and OMD UK, follows on from the myth-busting approach adopted in "The Cow" ad released earlier this year, and aims to promote the quality of McDonald's core products -- fries and chicken.