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

Context paragraphs:
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.

Zhaozhou County: Zhaozhou County () is a county of southwestern Heilongjiang province, People's Republic of China, bordering Jilin province to the south.  It is under the jurisdiction of the prefecture-level city of Daqing.

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.

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.

Qitaihe: Qitaihe () is a prefecture-level city in eastern Heilongjiang province, People's Republic of China.  Covering an area 6,223 km2 , it is geographically the smallest prefecture-level division of the province.  Qitaihe also has the second smallest population of the cities in Heilongjiang.  At the 2010 census, its total population was 920,419, while 620,935 live in the built up area made of 3 urban districts.

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.

Tongliao–Ranghulu Railway: The Tongliao–Ranghulu Railway or Tongrang Railway (), is a railroad in northeastern China, between Tongliao station in Inner Mongolia and Daqing west station(formerly Ranghulu Station) on the Harbin-Manzhouli Railway in Heilongjiang Province.  The railway has a total length of 421 km and runs north-south from eastern Inner Mongolia through western Jilin Province to the oil fields of Daqing in western Heilongjiang.  The line was built from 1964 to 1966.  Major cities and towns along route include Tongliao, Da'an, and Daqing.

Anda, Heilongjiang: Anda () is a county-level city in western Heilongjiang province, People's Republic of China, located on the Harbin-Manzhouli Railway (formerly known as the Chinese Eastern Railway) about 30 km southeast of Daqing and 110 km northwest of Harbin, and is under the administration of Suihua City.  Home to China's forage and dairy industries, more than 1814 km² out of Anda's 3586 km² total area is made up of grasslands.

Suihua: Suihua () is a prefecture-level city in west-central Heilongjiang province, People's Republic of China, adjacent to Yichun to the east, Harbin, the provincial capital, to the south, Daqing to the west and Heihe to the north.  It has 5,418,453 inhabitants at the 2010 census, of whom 877,114 lived in the built-up ("or metro") area made of Beilin District.

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.

Supporting paragraphs: Daqing Pengzhou
Answer: Daqing