Question: Between Mianyang and Shangluo, which one is the larger prefecture-level city?
Context: Heze () is a prefecture-level city in southwestern Shandong, China.  It is home to 8,287,693 inhabitants, of whom 1,346,717 live in the built-up ("or metro") area comprising Mudan District.  The westernmost prefecture-level city in Shandong, it borders Jining to the east and the provinces of Henan and Anhui to the west and south respectively.  The old name of Heze was Caozhou (曹州 ; Cáozhōu) and now a part of the city bears this name.  The first character in the city's name is sometimes incorrectly written as "荷 " instead. Min Mountains or Minshan () are a mountain range in central China.  It runs in the general north-south direction through northern Sichuan (the eastern part of the Ngawa Tibetan and Qiang Autonomous Prefecture and adjacent areas of Mianyang Prefecture-level city) and southernmost borderlands of Gansu.  The highest elevation is Mount Xuebaoding ("Snow Treasure Peak"), 5588 m and the second highest is Mt Little Xuebaoding ("Little Snow Treasure Peak"), 5443m. Shangluo () is a prefecture-level city in southeastern Shaanxi province, People's Republic of China, bordering Henan to the northeast and Hubei to the southeast.  Part of the Shannan region of the province, it is located in the eastern part of the Qin Mountains (Qin Ling).  The name, "Shangluo", comes from Han Dynasty when four famous people were settled in Shang Mountain to avoid war and famine. Taobei District () is the main urban district of the prefecture-level city of Baicheng in China's northeastern Jilin province.  It was formerly the county-level city of Baicheng until 1993, when the former Baicheng Prefecture became Baicheng prefecture-level city, while the prefectural capital Baicheng county-level city was renamed Taobei District. Langfang (), is a prefecture-level city of Hebei Province, which was known as Tianjin Prefecture until 1973.  Hebei province was renamed Langfang Prefecture after Tianjin became a municipality and finally upgraded into a prefecture-level city in 1988.  Langfang is located approximately midway between Beijing and Tianjin.  At the 2010 census, the population of Langfang was 4,358,839, of whom 868,066 lived in the built-up ("or metro") area made of Guangyang and Anci districts; its total area is around 6417.28 km² .  Langfang borders Baoding to the southwest, Cangzhou to the south (both prefecture-level cities of Hebei), Beijing to the north and Tianjin to the east.  Sanhe City and Dachang Hui County are now conurbated with Beijing, so that they form part of the same built-up area.  Langfang is the smallest prefecture-level city of Hebei Province by land area. Danzhou () is a prefecture-level city in the northwest of the Chinese island province of Hainan.  Although called a "city", Danzhou administers a large area which was called Dan County or Danxian (儋县) until 1993.  The administrative seat and urban center of Danzhou is Nada Town, which is often colloquially referred to as Danzhou city.  Danzhou was upgraded from a county-level city into a prefecture-level city in February 2015. Yizhou (; ), is the central district of the Hami prefecture-level city, in Xinjiang Uyghur Autonomous Region, China.  Its population was 472,175 at the end of 2010.  It was known as Hami county-level city until February 2016, when it was merged with the Hami Prefecture to form the Hami prefecture-level city, and the county-level city was renamed Yizhou District. Mianyang () is the second largest prefecture-level city of Sichuan province in Southwest China.  Its population was 5.45 million in 2015 covering an area of 20281 km² consisting of Jiangyou, a county-level city, six counties and two urban districts.  Its built-up ("or metro") area was home to 1,722,133 inhabitants including the city proper of Mianyang ("two urban districts") and An County largely being conurbated as urbanisation sprawls.  In 2006, Mianyang was ranked as China's third "most suitable city for living" by "China Daily", after coastal cities Dalian and Xiamen. , but it has since dropped out of the top 10. Chang'an District () is one of nine districts of Xi'an, the capital of Shaanxi province, China.  It is the most spacious of the nine districts and third-largest out of all 13 county-level divisions of Xi'an, while it is also the second most-populous.  The district borders the prefecture-level cities of Shangluo to the southeast and Ankang to the southwest, Weiyang and Yanta Districts to the north, Baqiao District to the northeast, Lantian County to the east, and Hu County to the west. Ulanqab or Wūlánchábù (Mongolian: ; Улаанцав хот, "Uláncaw hot"; ) is a region administered as a prefecture-level city in south-central Inner Mongolia, People's Republic of China.  Its administrative centre is in Jining District, which was formerly a county-level city.  It was established as a prefecture-level city on 1 December 2003, formed from the former Ulanqab League.
Answer: Mianyang