The Buick LaCrosse is a large/mid-size luxury car manufactured and marketed by Buick since 2004.
 The LaCrosse is now in its third generation, slotted above the Buick Regal as the brand's flagship.
The Roewe 550 is a mid-size car that is produced by Roewe in China and was launched at the 2008 Beijing Motor Show.
 The 550 is reported to be derived from the MG Rover RDX60 project (itself based on the platform of the Rover 75) which was under development when MG Rover failed.
The MG 5 is a compact car that has been produced by the British company MG Motor from 2012 onwards.
 It was launched on 28 March 2012 in China, and shares the same automotive platform with the Roewe 350 saloon car.
 The MG 5 debuted in concept car form at the 2011 Shanghai Auto Show as the MG Concept5.
The Roewe 350 is a small family car produced by Roewe in China from 2010 onwards.
 It is sold in international markets as the MG 350.
Roewe is a vehicle marque created by the Chinese automaker SAIC Motor in 2006.
 Roewe vehicles were initially based on technology acquired from defunct British carmaker MG Rover.
 SAIC was unable to purchase the rights to the Rover brand name and created the Roewe marque as a replacement.
 The MG name is preferred in most markets outside China.
The Roewe E50 is an all-electric car that is manufactured by the Chinese manufacturer Roewe.
The Roewe 950 is a large four-door saloon that is produced by Roewe in China and is based on the 2010 Buick LaCrosse.
 It was first shown to the public at the 2012 Beijing International Motor Show.
The MG 6 is a mid-size car that has been produced by MG Motor from 2010 onwards.
 It is derived from the Roewe 550, hence being distantly related to the Rover 75, sharing its front subframe.
 It was initially announced in April 2009 at the Shanghai Auto Show, as a five door hatchback/fastback and in October 2010 at Shanghai Expo as a four door notchback saloon model.
The Roewe W5 is a mid-size luxury SUV manufactured by Roewe in China, first unveiled at the Auto Shanghai exhibition in 2011.
 It is based on the SsangYong Kyron and is sold only in China.
The Roewe 750 is an executive saloon that was produced by Roewe in China between 2006-2016, based on the Rover 75.

Question: What Generation is the car that the Roewe is based on in?
Answer: third generation