Question: What company did Barrie D'Rozario DiLorenzo work with that placed sixth in the Fortune 500?

Context paragraphs:
UnitedHealth Group: UnitedHealth Group Inc. is an American managed health care company based in Minnetonka, Minnesota.  It is sixth in the United States on the Fortune 500.  UnitedHealth Group offers products and services through two operating businesses, UnitedHealthcare and Optum, both subsidiaries of UnitedHealth Group.  Optum is a healthcare service arm of UnitedHealth Group and the largest healthcare IT company in the world by revenue ($84 billion in 2016).  Together, Optum and Unitedhealthcare serve approximately 115 million individuals in 2016.  In 2016, the company reported an operating income of $13 billion.

Precision Castparts Corp.: Precision Castparts Corp. is an American industrial goods and metal fabrication company that manufactures investment castings, forged components, and airfoil castings for use in the aerospace, industrial gas turbine, and defense industries.  In 2009 it ranked 362nd on the Fortune 500 list, and 11th in the aerospace and defense industry.  In 2015 it ranked 322nd overall and 9th in the aerospace and defense industry.  In 2014 it ranked 133rd on the S&P 500 based on market capitalization.  In January 2016, the company became a subsidiary of Berkshire Hathaway.  Before that event, it used to be one of the three Fortune 500 companies headquartered in Oregon.

Liz Claiborne: Anne Elisabeth Jane Claiborne (March 31, 1929 – June 26, 2007) was a Belgian-born American fashion designer and businesswoman.  Her success was built upon stylish yet affordable apparel for career women featuring colorfully tailored separates that could be mixed and matched.  Claiborne is best known for co-founding Liz Claiborne Inc., which in 1986 became the first company founded by a woman to make the Fortune 500 list.  Claiborne was the first woman to become chair and CEO of a Fortune 500 company.

Southern Company Gas: Southern Company Gas, formerly AGL Resources, is an American Fortune 500 energy services holding company headquartered in Atlanta, Georgia.  The company’s operations consist of natural gas distribution, wholesale services, retail operations, and midstream operations.  Southern Company Gas is one of the largest natural gas distribution companies in the United States.  The company serves 4.5 million utility customers through its regulated distribution subsidiaries across seven states.  Southern Company Gas made the Fortune 500 list in 2015, Forbes 2000 in 2006, and is a member of the S&P 500 Index.  In 2016, Southern Company bought out AGL and renamed it Southern Company Gas.

Lithia Motors: Lithia Motors, Inc. is an American nationwide automotive retailer headquartered in Medford, Oregon.  It is the fourth largest automotive retailer in the United States.  In 2015, Lithia Motors broke into the Fortune 500 list at #482, making it one of only three Oregon-based companies in the Fortune 500.  This followed a year that saw the acquisition of the DCH Auto Group, one of the 10 largest dealer groups in the country, with 27 dealerships, before being purchased by Lithia Motors.  In 2016, Lithia climbed to #346 and that same year made the Fortune 500 List of Top Ten Companies with the biggest Jump in rank on the Fortune 500.  Today, Lithia is ranked #318 on the Fortune 500.  Lithia employs more than 11,100 people in stores across the nation including Alaska and Hawaii.  Lithia operates 160 stores in 18 states.

Sonic Automotive: Sonic Automotive, Inc. () is a Fortune 500 company based in Charlotte, North Carolina, and is the fifth largest automotive retailer in the United States.  The company’s founder and Executive Chairman O. Bruton Smith is also the Executive Chairman and a director of Speedway Motorsports (NYSE: TRK).  Sonic ranked 297th on the 2016 Fortune 500 list.  The company also is a member of the Russell 2000 index.

ABB Group: ABB (ASEA Brown Boveri) is a Swedish-Swiss multinational corporation headquartered in Zürich, Switzerland, operating mainly in robotics, power, heavy electrical equipments, and automation technology areas.  It is ranked 286th in The World's Most Admired companies in the Fortune 500 global list of 2016.  ABB has been a Global Fortune 500 company for 23 years.

Barrie D'Rozario DiLorenzo: Barrie D'Rozario DiLorenzo, formerly Barrie D'Rozario Murphy, is a marketing and advertising agency in Minneapolis, Minnesota.  It was founded in November 2006 by original partners Bob Barrie, Stuart D'Rozario and David Murphy.  Before founding the agency, Barrie and D'Rozario worked at Fallon Worldwide where they were responsible for the award-winning United Airlines campaign "It's Time to Fly".  Over the last 7 years, the agency has worked with a wide range of Fortune 500 companies including Dell Computer, Lands' End, Medtronic, Wagner Spray Tech, United Airlines, Best Buy, UnitedHealth Group, Optum, Bissell Inc., Chase Bank, Applied Materials, Compellent, Del Webb Homes, Chambers Hotel and the Sunset Marquis Hotel.

Fortune 500: The Fortune 500 is an annual list compiled and published by "Fortune" magazine that ranks 500 of the largest United States corporations by total revenue for their respective fiscal years.  The list includes publicly held companies, along with privately held companies for which revenues are publicly available.  The concept of the Fortune 500 was created by Edgar P. Smith, a "Fortune" editor, and the first list was published in 1955.  The Fortune 500 is more commonly used than its subset Fortune 100 or wider list Fortune 1000.

Ursula Burns: Ursula M. Burns (born September 20, 1958) is an American business leader who has been Chairwoman of Xerox since 2010, and was Xerox CEO from 2009 to 2016.  Burns was the first African-American woman CEO to head a Fortune 500 company.  She is also the first woman to succeed another woman as head of a Fortune 500 company, having succeeded Anne Mulcahy as CEO of Xerox.  In 2014, "Forbes" rated her the 22nd most powerful woman in the world.

Supporting paragraphs: Barrie D'Rozario DiLorenzo UnitedHealth Group
Answer: UnitedHealth Group