Question: Which city is more populous, Liaoyang or Changchun?
Related documents: [0]  [DOC] Changchun () is the capital and largest city of Jilin Province, and is located in the northeast of China. Lying in the center of the Songliao Plain, Changchun is administered as a , comprising 7 districts, 1 county and 2 county-level cities. According to the 2010 census of China, Changchun had a total population of 7,674,439 under its jurisdiction. The city's urbanized ("or metro") area, comprising 5 districts and 4 development areas, had a population of 3,815,270 in 2010 as the Shuangyang and Jiutai districts are not urbanized yet. [END] 
[1]  [DOC] Liaoyang () is a prefecture-level city of east-central Liaoning province, People's Republic of China, situated on the T'ai-tzu River and, together with Anshan, forms a metro area of 2,057,200 inhabitants in 2010. It is approximately one hour south of Shenyang, the provincial capital, by car. Liaoyang is home to Liaoning University's College of Foreign Studies and a number of vocational colleges. The city hosts a limited number of professional basketball and volleyball games in a modern sports facility. [END] 
Answer: 
Changchun
Changchun