Question: Which city, Daqing or Pengzhou, is a prefecture-level city in the west of Heilongjiang province, People's Republic of China?

full_context: Document 1: Karamay: Karamay or Kelamayi is a prefecture-level city in the north of the Xinjiang Uygur Autonomous Region, People's Republic of China. The name of the city comes from the Uyghur language, and means "black oil", referring to the oil fields near the city.
Document 2: Heilongjiang: Heilongjiang () is a province of the People's Republic of China. Located in the northeastern part of the country, Heilongjiang is bordered by Jilin to the south and Inner Mongolia to the west. It also shares a China–Russia border with Russia to the north and east. The capital and the largest city of the province is Harbin. Among Chinese provincial level Administrative divisions, Heilongjiang is the 6th largest by total area and the 15th most populous.
Document 3: Kangding: Kangding (Chinese) or Dartsedo (Tibetan), is a city and the location of the seat of Garzê Tibetan Autonomous Prefecture in western Sichuan province of Southwest China. Kangding's urban center has around 100,000 inhabitants.
Document 4: Chengdu–Kunming Railway: The Chengdu–Kunming Railway or Chengkun Railway (), is a major trunkline railroad in southwestern China between Chengdu, the capital of Sichuan Province and Kunming, the capital of Yunnan Province. The line is 1,134 km long and traverses rugged terrain from the Sichuan Basin to the Yunnan-Guizhou Plateau. The line was built between 1958 and 1970. Major cities along route include Chengdu, Pengshan, Jiajiang, Emei, Ebian, Ganluo, Xide, Xichang, Dechang, Miyi and Panzhihua in Sichuan Province and Yuanmou, Lufeng, Anning and Kunming in Yunnan Province.
Document 5: Haidong: Haidong (; Wylie: Haitung) is a prefecture-level city of Qinghai province in Western China. Its name literally means "east of the (Qinghai) Lake." On 8 February 2013 Haidong was upgraded from a prefecture () into a prefecture-level city. Haidong is the second largest city in Qinghai after Xining.
Document 6: Daqing West Railway Station: Daqing West Railway Station is a railway station of the Harbin–Qiqihar Intercity Railway. It is located at the city of Daqing, in the Heilongjiang province of China.
Document 7: Pengzhou: Pengzhou (), formerly Peng County or Pengxian, is a county-level city under the jurisdiction of Chengdu, the capital of Sichuan province, People's Republic of China, some 19 km (11.81 mi) northwest of Chengdu. There is an expressway that connects Pengzhou to Chengdu. It is bordered by the prefecture-level divisions of Deyang to the northeast and the Ngawa Tibetan and Qiang Autonomous Prefecture to the north.
Document 8: Panzhou: Panzhou () is a county-level city of Guizhou, China. It is under the administration of Liupanshui city.
Document 9: Daqing East Railway Station: Daqing East Railway Station is a railway station of the Harbin–Qiqihar Intercity Railway and Harbin–Manzhouli Railway. It is located at the city of Daqing, in the Heilongjiang province of China.
Document 10: Daqing Sartu Airport: Daqing Sartu Airport (IATA: DQA, ICAO: ZYDQ) is an airport (class 4C) serving the city of Daqing in Heilongjiang Province, China. Construction started in 2007 with a total investment of 500 million yuan, and the airport was opened on 1 September 2009.
Document 11: Daqing: Daqing (; formerly romanized as Taching) is a prefecture-level city in the west of Heilongjiang province, People's Republic of China. The name literally means "Great Celebration". Daqing is known as the Oil Capital of China and has experienced a phenomenal boom since oil was discovered at the Daqing Oil Field in 1959.
Document 12: 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 13: Guanghan: Guanghan () is a county-level city in Deyang, Sichuan province, China, and only 23 km from Chengdu. The predominant industries are tourism, pharmaceuticals and the supply of building material.
Document 14: Chenjiaping Bus Station: Chenjiaping Bus Station () is a bus station located in Shapingba District, Chongqing, China, and is located near the eastern terminus of the Chengyu Expressway, running from Chongqing to Chengdu. Routes run to Chengdu, Jianyang, Neijiang, Longchang, Luzhou, Suining, Yibin, Zigong, and Ziyang, all of which are in Sichuan province, and within the municipality, the station is connected directly to Jiangjin, Yongchuan Districts as well as the counties of Bishan Dazu, Rongchang, Tongliang and Tongnan and finally the town of Dingjia (丁家鎮)
Document 15: 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.
ground_truth: Daqing