sentences:  The agency, who had already been working with the chain for several months as a secondary ad firm, introduced a new "people-centric" advertising program for the new sandwich line-up.The Chicken Burger was introduced in 2016 in the United States and Canada, and is Burger King's second foray into a non-beef hamburger in North America.The Chicken Jr. is a small fried chicken sandwich that consists of a chicken patty, lettuce and mayonnaise served on a sesame seed bun.