Question: What major French automobile manufacturer uses the PSA EW/DW engine?
Context: SECMA (Société d'Etude et de Construction de Mecanique Automobile) is a French automobile manufacturer located in Aniche, France. Établissements Monotrace S.A. (previously Ateliers du Rond Point) was a French automobile manufacturer, based (fgrom 1926) at Courbevoie, on the edge of Paris, from 1924 till 1930.  Although it was presented as a type of automobile, the Monotrace was in some respects more like a motor cycle than a conventional motor car. The Guangzhou Peugeot Automobile Company (GPAC) is a former automobile manufacturer located in Guangzhou, China.  It was a joint venture between the Guangzhou municipal government and the Peugeot brand of the French automobile manufacturer PSA Peugeot Citroën. Citroën (] ) is a major French automobile manufacturer, part of the PSA Peugeot Citroën group since 1976, founded in 1919 by French industrialist André-Gustave Citroën (1878–1935). VELAM ("Véhicule Léger à Moteur", or "light vehicle with motor") was a French automobile manufacturer that made "VELAM" microcars under the licence of the Isetta from the Italian Iso.  Powered by a 236 cc engine, it was capable of speeds in excess of 50 mi/h . The Peugeot 908 HDi FAP is a sports prototype racing car built by the French automobile manufacturer Peugeot to compete in the 24 Hours of Le Mans endurance race, starting in 2007 and eventually winning in 2009.  This effort, in development since 2005, was publicly unveiled on 15 June 2005.  It first competed against the Audi R10 TDI, becoming the second diesel engined sports car from a major manufacturer, and then against the Audi R15 TDI.  This was Peugeot Sport's first Le Mans effort since the end of the Peugeot 905 project in 1993.  It won 19 from the 28 races in which it raced between 2007 and 2010. Hommell is a French Automobile manufacturer, started in 1990 by Michel Hommell, a former racing driver and the owner of Échappement, a French car magazine.  The company is based in Lohéac, near Rennes, Brittany.  A prototype of the kind of sports car he would like to be produced was shown at the 1990 Paris Salon, where it was well received, encouraging him to go ahead with a production version.  This was shown at the 1994 Geneva Motor Show.  The 2 seat sports coupe is powered by a mid-mounted 2.0lt Peugeot engine and 6 speed gearbox in a tubular steel chassis with all-round independent suspension. The PSA EW/DW engine is a family of straight-4 petrol and diesel engines manufactured by the PSA Group for use in their Peugeot and Citroën automobiles.  The EW/DW family was introduced in 1998 as a replacement for the XU engine A.E.R. was a French automobile manufacturer and one-time subsidiary of B.N.C.; the marque offered two cars patterned on American models.  One was an sv 1991cc six-cylinder with CIME engine; the other used a Lycoming side valve straight-eight of 4241 cc and Delaunay-Belleville chassis.  Unusually, suspension was by a pneumatic device which soon proved unreliable.  Production ceased after one year of manufacture (1930), but the cars were later reissued under the name , in models using conventional suspension. Opel Automobile GmbH (Opel, ] ) is a German automobile manufacturer, a subsidiary of the French automobile manufacturer Groupe PSA since 1 August 2017.  In March 2017, Groupe PSA agreed to acquire Opel from General Motors.  The acquisition was approved by the European Commission regulatory authorities in July 2017.  Opel's headquarters are in Rüsselsheim am Main, Hesse, Germany.  The company designs, engineers, manufactures and distributes Opel-branded passenger vehicles, light commercial vehicles, and vehicle parts for distribution in Africa, Asia, Europe, and South America.  Opel designed and manufactured vehicles are also sold under the Vauxhall brand in Great Britain, the Buick brand in the United States, Canada, Mexico, and China and the Holden brand in Australia and New Zealand.
Answer: Citroën