Question: Between Mianyang and Shangluo, which one is the larger prefecture-level city?

full_context: Document 1: Shangqiu: Shangqiu (), formerly romanized as Shangkiu, is a city in eastern Henan province, Central China. It borders Kaifeng to the northwest, Zhoukou to the southwest, and the provinces of Shandong and Anhui to the northeast and southeast respectively. An ancient city with a rich history, Shangqiu was also the first capital of the Shang dynasty. Its population was 7,362,975 inhabitants at the 2010 census whom 1,536,392 lived in the built-up ("or metro") area made up of Liangyuan and Suiyang districts.
Document 2: Shangluo: 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.
Document 3: Shaanxi: Shaanxi () is a province of the People's Republic of China. Officially part of the Northwest China region, it lies in central China, bordering the provinces of Shanxi (NE, E), Henan (E), Hubei (SE), Chongqing (S), Sichuan (SW), Gansu (W), Ningxia (NW), and Inner Mongolia (N). It covers an area of over 205,000 sqkm with about 37 million people. Xi'an—which includes the sites of the former Chinese capitals Fenghao and Chang'an—is the provincial capital. Xianyang, which served as the Qin capital, is located nearby. The other prefecture-level cities into which the province is divided are Ankang, Baoji, Hanzhong, Shangluo, Tongchuan, Weinan, Yan'an and Yulin.
Document 4: Shenmu: Shenmu () is a county-level city in the north of Shaanxi province, China. Under the administration of Yulin City, Shenmu is endowed with plentiful resources, especially coal and it located in the northwest of Shaanxi Provence. It is the richest county in Shaanxi Provence because of the abundant coal.
Document 5: Panzhihua: Panzhihua () is a prefecture-level city located in the far south of Sichuan province, People's Republic of China, at the confluence of the Jinsha and Yalong Rivers. It has an administrative area of 74423.42 km2 , and a population at the 2010 census of 1,214,121. 662,814 lived in the metropolitan area made of 3 urban districts.
Document 6: Mengzi City: Mengzi () is a city in the southeast of Yunnan province, People's Republic of China. Administratively, it is a county-level city and the seat of the Honghe Hani and Yi Autonomous Prefecture, located about 175 km south-southeast of the provincial capital of Kunming. It is situated in the centre of a fertile valley basin on a plateau 1000 m above sea level. Mengzi was formerly Mengzi County (蒙自县 ) until October 2010, when it was upgraded to a county-level city.
Document 7: Langzhong: Langzhong is a county-level city in northeastern Sichuan, China, located on the middle reaches of the Jialing River. It is administered as part of the prefecture-level city of Nanchong. Langzhong has a total population of 840,000, with 200,000 residing in the urban area.
Document 8: Meizhou: Meizhou is a prefecture-level city in eastern Guangdong province, China. It has an area of 15864.51 km² , and a population of 4.33 million at the 2010 census. It comprises Meijiang District, Meixian District, Xingning City and five counties. Its built-up or metro area made up of two districts was home to 935,516 inhabitants at the 2010 census.
Document 9: Quanzhou: Quanzhou, formerly known as Chinchew, is a prefecture-level city beside the Taiwan Strait in Fujian Province, China. Its is Fujian's largest metropolitan region, with an area of 11,245 km2 and, as of the 2010 census, a population of 8,128,530. Its built-up area is home to 6,107,475 inhabitants, encompassing the Licheng, Fengze, and Luojiang urban districts; Jinjiang, Nan'an, and Shishi cities; Hui'an County; and the Quanzhou District for Taiwanese Investment. Quanzhou was China's 12th-largest extended metropolitan area in 2010.
Document 10: Yulin, Shaanxi: Yulin () is a prefecture-level city in the Shanbei region of Shaanxi province, China, bordering Inner Mongolia to the north, Shanxi to the east, and Ningxia to the west. It has an administrative area of 43578 km2 and a population of 3,380,000.
Document 11: Miluo City: Miluo () is a county-level city in Hunan province, China, it is under the administration of Yueyang Profecture-level City. The city is located on the northeast of the province and on the eastern bank of the Xiang River, it is to the north of the city proper of Changsha City. Miluo is bordered to the north by Yueyang County, to the east by Pingxiang County, to the south by Changsha County and Wangcheng District of Changsha City, to the west by Xiangyin County and Yuanjiang City. Miluo covers an area of 1,669.8 km2 , as of 2015, it had a permanent resident population of 668,156. The city has 3 subdistricts and 10 towns under its jurisdiction. the government seat is Guiyi (归义镇).
Document 12: Ankang: Ankang () is a prefecture-level city in southern Shaanxi Province in the People's Republic of China.
Document 13: Jianyang, Sichuan: Jianyang () is a county-level city located in the Sichuan basin in Sichuan Province, in south central China. Situated only 48 kilometers south east of the city center of Chengdu, Jianyang is administratively under the jurisdiction of Chengdu since May 2016. The urban center is located on the banks of the Tuo River.
Document 14: Luohe: Luohe (; postal: Loho) is a prefecture-level city in central Henan province, China. It is surrounded by the cities of Xuchang, Zhoukou, Zhumadian and Pingdingshan on its north, east, south and west respectively.
Document 15: Mianyang: 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.
ground_truth: Mianyang