Question: What German rally and auto racing driver, born on March 7, 1947 was beaten at the World Rally Championship while attempting to defend his title as World Champion?
Context: The 1983 World Rally Championship was the 11th season of the Fédération Internationale de l'Automobile (FIA) World Rally Championship (WRC).  The season consisted of 12 rallies.  By this time, the schedule format had become generally stable, with only one or two changes to venues year to year.  1983 brought the return of Argentina to the schedule in place of Brazil.  Audi's Hannu Mikkola beat the defending world champion Walter Röhrl and his Lancia teammate Markku Alén to the drivers' title.  Lancia captured the manufacturers' title from Audi by just two points. Rally Bulgaria (Рали България) is the most prestigious and also the oldest rally event in Republic of Bulgaria.  It was confirmed for the 2010 World Rally Championship season as the seventh of all thirteen planned events.  Year 2010 was also the first and so far the only one that Rally Bulgaria has been in the World Rally Championship, having previously hosted races for the European Rally Championship instead.  The application of the country was accepted by the FIA despite the fact that Rally Bulgaria's candidate event in July 2009 ended in an accident which killed Italian co-driver Flavio Guglielmini and seriously injured Swiss driver Brian Lavio.  Bulgaria was the only new candidate for the 2010 World Rally Championship season, although Rally Argentina had made a reserve application just in case Bulgarian rally failed. The 2017 FIA World Rally Championship is the forty-fourth season of the World Rally Championship, an auto racing championship recognised by the Fédération Internationale de l'Automobile (FIA) as the highest class of international rallying.  Teams and crews are competing in thirteen events—starting in Monte Carlo on 19 January and ending in Australia on 19 November—for the World Rally Championships for Drivers, Co-drivers and Manufacturers.  Drivers are free to compete in cars complying with World Rally Car and Group R regulations; however, only Manufacturers competing with 2017-specification World Rally Cars are eligible to score points in the Manufacturers' championship.  The series is once again supported by the WRC-2 and WRC-3 championships and the newly created WRC Trophy at every round, and by the Junior World Rally Championship at selected rounds. Jimmy McRae (born 28 October 1943) is a British rally driver.  He was highly successful in the British Rally Championship, winning the title five times in 1981, 1982, 1984, 1987 and 1988.  In the European Rally Championship for drivers, he was runner-up in 1982, while his highest placing in the World Rally Championship was fifteenth in 1983.  Aside from his rallying career, McRae has maintained and run a very busy plumbing business in his home town of Lanark.  Jimmy and his wife Margaret had three sons, Colin, Alister and Stuart.  He is the father of World Rally Championship driver Alister McRae, and the late 1995 World Rally Champion Colin McRae. Nasser Salih Nasser Abdullah Al-Attiyah (Arabic: ناصر صالح ناصر عبدالله العطية‎ ‎ ; born 21 December 1970 in Doha) is a Qatari rally driver and sport shooter.  He was the 2006 Production World Rally Champion, a 12-time Middle East Rally Champion, 2014 and 2015 WRC-2 champion, three times winner of FIA cross-country rally Cup (2008,2015 and 2016) and the 2011 and 2015 Dakar Rally winner.  He currently competes in the World Rally Championship and Middle East Rally Championship for the Qatar World Rally Team.  He is the only Middle Eastern to win the Dakar Rally twice.  (2011, 2015). The 2017 World Rally Championship-2 is the fifth season of the World Rally Championship-2, an auto racing championship recognised by the Fédération Internationale de l'Automobile, running in support of the World Rally Championship.  It was created when the Group R class of rally car was introduced in 2013.  The Championship is open to cars complying with R4, R5, and Super 2000 regulations.  Esapekka Lappi did not return to defend his 2016 title as left Škoda Motorsport for the top WRC category to become third driver of Toyota GAZOO Racing. Armin Schwarz (born 16 July 1963) is a German rally driver.  He competed in the World Rally Championship from 1988 to 2005, winning the 1991 Rally Catalunya and taking six other podium finishes.  Outside the WRC, he won the German Rally Championship (1987–88), the European Rally Championship (1996) and the "Rally Masters" event at the Race of Champions (2000). The Rally of Poland (in Polish, "Rajd Polski") is a motorsport event for rally cars that was first established in 1921.  It is second-oldest rally in the world, preceded only by Monte Carlo Rally.  In 1973, the Rally of Poland was the one of the thirtern rounds of newly established FIA World Rally Championship, but was removed from the 1974 calendar.  It later found a place as a round of the European Rally Championship, and after a move to Mikołajki in the Masurian Lake District in 2005, event organisers started lobbying for the event's inclusion as a round of the World Rally Championship.  After being run as a candidate event in 2007 and 2008, Poland returned to the World Rally Championship in 2009, which was won by Mikko Hirvonen.  However, the event was once again removed after a single season, and was replaced by Rally Bulgaria. Walter Röhrl (born 7 March 1947) is a German rally and auto racing driver, with victories for Fiat, Opel, Lancia and Audi as well as Porsche, Ford and BMW. The 2018 FIA World Rally Championship will be the forty-fifth season of the World Rally Championship, an auto racing championship recognised by the Fédération Internationale de l'Automobile (FIA) as the highest class of international rallying.  Teams and crews will compete in fourteen events for the World Rally Championships for Drivers, Co-drivers and Manufacturers.  Crews are free to compete in cars complying with World Rally Car and Group R regulations; however, only Manufacturers competing with 2017-specification World Rally Cars are eligible to score points in the Manufacturers' championship.  The series will once again be supported by the WRC-2 and WRC-3 championships and the WRC Trophy at every round, and by the Junior World Rally Championship at selected rounds.
Answer: Walter Röhrl