Question: To which scandal was Kenneth Roy Feinberg retained to assist that started on 18 September 2015?

Context paragraphs:
Volkswagen emissions scandal: The Volkswagen emissions scandal (also called "emissionsgate" or "dieselgate") started on 18 September 2015, when the United States Environmental Protection Agency (EPA) issued a notice of violation of the Clean Air Act to German automaker Volkswagen Group.  The agency had found that Volkswagen had intentionally programmed turbocharged direct injection (TDI) diesel engines to activate some emissions controls only during laboratory emissions testing.  The programming caused the vehicles' NO output to meet US standards during regulatory testing but emit up to 40 times more NO in real-world driving.  Volkswagen deployed this programming in about eleven million cars worldwide, and 500,000 in the United States, during model years 2009 through 2015.

Katti Batti: Katti Batti is an Indian romantic drama film directed by Nikhil Advani and produced by Siddharth Roy Kapur under the banner of UTV Motion Pictures.  The film stars Kangana Ranaut and Imran Khan in the lead roles.  The first look of the movie was revealed on 12 June 2015, and the trailer of the movie was released on 14 June 2015.  The film was released on 18 September 2015.

I'd Be Lost / Only One: "I'd Be Lost" and "Only One" are two songs recorded by Australian singer-songwriter Sarah Blasko for her fifth studio album "Eternal Return".  Both songs premiered on 13 September 2015 during Richard Kingsmill's new music segment on Triple J and were released as a double A-side on 18 September 2015.

Kenneth Daniel: Kenneth Roy Daniel (31 August 1892 – 23 September 1965) was a Progressive Conservative party member of the Canadian House of Commons.  He was born in Ingersoll, Ontario and became a farmer by career.

Kenneth Roy MacLeod: Kenneth Roy MacLeod (September 10, 1927 – March 30, 2011) was a lawyer, judge and political figure in Saskatchewan.  He represented Regina Albert Park from 1971 to 1975 in the Legislative Assembly of Saskatchewan as a Liberal.

Ken Carrington: Kenneth Roy Carrington (born 3 September 1950) is a former New Zealand rugby union player.  A wing and centre three-quarter, Carrington represented Auckland and, briefly, Bay of Plenty at a provincial level, and was a member of the New Zealand national side, the All Blacks, from 1971 to 1972.  He played nine matches for the All Blacks including three internationals.

Barnaby Joyce: Barnaby Thomas Gerard Joyce (born 17 April 1967) is an Australian politician who has served as the Deputy Prime Minister of Australia since 18 February 2016, as the Leader of the National Party of Australia since 11 February 2016, and as the Minister for Agriculture and Water Resources since 21 September 2015.  He was sworn in as Minister for Agriculture in the Abbott Government on 18 September 2013.  Water Resources was added to his portfolio on 21 September 2015 in the Turnbull Government.

Kenneth Feinberg: Kenneth Roy Feinberg (born October 23, 1945) is an American attorney, specializing in mediation and alternative dispute resolution.  Feinberg was appointed Special Master of the U.S. government's September 11th Victim Compensation Fund and served as the Special Master for TARP Executive Compensation.  Additionally, Feinberg served as the government-appointed administrator of the BP Deepwater Horizon Disaster Victim Compensation Fund.  Feinberg was appointed by the Commonwealth of Massachusetts to administer the One Fund—the victim assistance fund established in the wake of the 2013 Boston Marathon bombings.  Feinberg was also retained by General Motors to assist in their recall response and by Volkswagen to oversee their U.S. compensation of VW diesel owners affected by the Volkswagen emissions scandal.  Kenneth Feinberg is also an adjunct professor at the Columbia University School of Law, University of Pennsylvania Law School, Georgetown University Law Center, New York University School of Law, the University of Virginia School of Law and at the Benjamin N. Cardozo School of Law.

Rashid bin Mohammed Al Maktoum: Sheikh Rashid bin Mohammed bin Rashid Al Maktoum (Arabic: الشيخ راشد بن محمد آل مكتوم‎ ‎ , styled "HH Sheikh Rashid"; 12 November 1981 – 19 September 2015) was the son of United Arab Emirates Vice President, Prime Minister and ruler of Dubai Sheikh Mohammed bin Rashid Al Maktoum and Sheikha Hind bint Maktoum bin Juma Al Maktoum.  He was former Crown Prince of Dubai till 2008 when he was replaced by his brother Hamdan.  At the age of 33, he died, according to the official report, of a heart attack on 18 September 2015.  He has a son named Mohammed bin Rashid Al Maktoum.

Kenneth Thomson, 2nd Baron Thomson of Fleet: Kenneth Roy Thomson, 2nd Baron Thomson of Fleet (September 1, 1923 – June 12, 2006), known in Canada as Ken Thomson, was a Canadian businessman and art collector.  At the time of his death, he was listed by "Forbes" as the richest person in Canada and the ninth richest person in the world, with a net worth of approximately US $19.6 billion.

Supporting paragraphs: Kenneth Feinberg Volkswagen emissions scandal
Answer: Volkswagen emissions scandal