Question: The car involved in the 2009 Singapore Romanian diplomat incident was manufactured in what country?

Context paragraphs:
2009 Singapore Romanian diplomat incident: The Singapore Romanian diplomat incident occurred on 15 December 2009, when three pedestrians were struck in a hit-and-run in the Singapore suburb of Bukit Panjang.  The vehicle, a black Audi A6 bearing diplomatic license plates, was later identified as being driven by Dr Silviu Ionescu, at the time Chargé d'Affaires ad interim of the Romanian Embassy in Singapore.  At approximately 3 am, the vehicle ran two red lights and hit the pedestrians on a pedestrian crossing, injuring two and killing one.  Approximately 40 minutes after the incident, Ionescu reported the vehicle as being stolen.  The car was later found abandoned in Sungei Kadut approximately 4 hours after the collisions.

Nicolae Petrescu-Comnen: Nicolae Petrescu-Comnen (] ; Gallicized as Petresco-Comnène, Petrescu-Comnène or N. P. Comnène, born Nicolae Petrescu; August 24, 1881 – December 8, 1958) was a Romanian diplomat, politician and social scientist, who served as Minister of Foreign Affairs in the Miron Cristea cabinet (between May 1938 and January 31, 1939).  He debuted in France as a public lecturer and author of several books on political history, then returned to Romania as a judge and member of the University of Bucharest faculty.  Comnen spent most of World War I in Switzerland, earning respect at home and abroad for his arguments in favor of nationalism, his publicizing of the Greater Romanian cause, and especially for his support of the Romanian community in Dobruja.  During the Paris Peace Conference, he was dispatched to Hungary, proposing political settlements that would have made the Treaty of Trianon more palatable to Hungarian conservatives.  Also noted as an eccentric who published poetry, he was often ridiculed for his claim to a Byzantine aristocratic descent from the Komnenos.

Filip Teodorescu: Filip Teodorescu (born December 26, 1951) is a Romanian diplomat.  He was the Romanian Ambassador to Moldova (2003–2009).

2009 Singapore Grand Prix: The 2009 Singapore Grand Prix (formally the 2009 Formula 1 SingTel Singapore Grand Prix) was a Formula One motor race held at the Marina Bay Street Circuit in Singapore on 27 September 2009.  The 61-lap race was the fourteenth round of the 2009 Formula One season.  It was the second Singapore Grand Prix to be part of a Formula One Championship and the tenth Singapore Grand Prix overall.  It was also the second Formula One race to be held at night.  The race was won by McLaren-Mercedes driver and reigning World Champion Lewis Hamilton.  Toyota's Timo Glock finished second and 2008 race winner Fernando Alonso took third position, making this the only race of the season with neither a Brawn nor a Red Bull driver on the podium.  This was also the last race of 2009 for Glock, as he was injured during qualifying for the Japanese Grand Prix and was replaced by test driver Kamui Kobayashi.  Heikki Kovalainen scored his last ever World Championship points at this race.

Giovenale Vegezzi Ruscalla: Giovenale Vegezzi Ruscalla (4 December 1799, Turin, Italy - December 1885, Turin), was a liberal Italian journalist, foreign honorary member of the Romanian Academy, and secretary to the Subalpine Agrarian Association.  He traveled to Transylvania and Banat on a study trip in 1830 and was an honorary citizen as a Romanian diplomat.  He translated poems of the Romanian poet and playwright Vasile Alecsandri and taught a history course and Romanian literature at the University of Turin.  At the Congress of Paris 1856 Ruscalla successfully debated in favour of Romanian independence.  (out of Moldavia and Wallachia).

Ion Jinga: Ion Jinga (born 1 September 1961, Câmpulung) is a Romanian diplomat working in the Romanian Ministry of Foreign Affairs since 1992.  Between 2003 and 2008 he served as the Romanian Ambassador to the Kingdom of Belgium and between 2008 and 2015 he held the position of Ambassador of Romania to the United Kingdom of Great Britain and Northern Ireland.  On 4 August 2015 he was appointed Ambassador extraordinary and plenipotentiary, Permanent Representative of Romania to the United Nations in New York.  He and his wife Daniela have one daughter.

Dimitrie Dimăncescu: Dimitrie Dem.  Dimăncescu (1896-1984) was a Romanian diplomat serving between 1922 and 1947.  In 1913 with his brother Ioan Dimăncescu, he founded the Romanian Boy Scout Movement.  He served as a military officer in World War I and in World War II was a member of the Free Romanian Movement in London while also working with British Intelligence to undermine Nazi influence in Romania.  In 1946 he was Secretary of the Romanian Delegation to the Paris Peace Conference.

Audi A6: The Audi A6 is an executive car made by the German automaker Audi AG, now in its fourth generation.  As the successor to the Audi 100, the A6 is manufactured in Neckarsulm, Germany – and is available in sedan and wagon configurations, the latter marketed by Audi as the "Avant."  Audi's internal numbering treats the A6 as a continuation of the Audi 100 lineage, with the initial A6 designated as a member of the C4-series, followed by the C5, C6, and the C7.  The related Audi A7 is essentially a coupé-hatchback version of the C7-series A6, but is marketed under its own separate identity and model designation.

Williams FW31: The Williams FW31 is a Formula One motor racing car, designed and built by WilliamsF1.  The "AT&T Williams" team used the FW31 to compete in the 2009 Formula One season.  The car was unveiled on 19 January 2009 at the Autódromo Internacional do Algarve circuit in southern Portugal, and was first driven by the team's test driver Nico Hülkenberg.  It was a mid-field runner, in contention for points on many occasions when driven by Rosberg, but rarely contending for podiums.  Rosberg could have finished in third position at Marina Bay during the 2009 Singapore Grand Prix if he had not run wide on the exit of the pit lane and received a penalty.

Victor Rădulescu-Pogoneanu: Victor I. Rădulescu-Pogoneanu (September 21, 1910 – March 10, 1962) was a Romanian diplomat.  He helped set up negotiations to remove his country from its alliance with Nazi Germany during World War II.  An opponent of the Romanian Communist Party, he was arrested shortly before the establishment of a communist regime and spent the next fifteen years in prison before succumbing to the treatment he received there.

Supporting paragraphs: 2009 Singapore Romanian diplomat incident Audi A6
Answer: Germany