Context: Chongqing, formerly transliterated as Chungking, is a major city in Southwest China and one of the Five national central cities in China. Administratively, it is one of China's four direct-controlled municipalities (the other three are Beijing, Shanghai and Tianjin), and the only such municipality in inland China., The Northern Silk Road is a prehistoric trackway in northern China originating in the early capital of Xi'an and extending north of the Taklamakan Desert to reach the ancient kingdoms of Parthia, Bactria and eventually Persia and Rome. It is the northern-most branch of several Silk Roads providing trade, military movements and cultural exchange between China and the west. The use of this route was expanded pursuant to actions by the Han Dynasty in the latter part of the first millennium BC to push back northern tribes and control the safe passage of Chinese troops and merchants., Beijing (formerly romanised as Peking) is the capital of the People's Republic of China and the world's third most populous city proper. It is also one of the world's most populous capital cities. The city, located in northern China, is governed as a direct-controlled municipality under the national government with 16 urban, suburban, and rural districts. Beijing Municipality is surrounded by Hebei Province with the exception of neighbouring Tianjin Municipality to the southeast; together the three divisions form the Jingjinji metropolitan region and the national capital region of China., Southwest China is a region of the People's Republic of China defined by governmental bureaus that includes the municipality of Chongqing, the provinces of Sichuan, Yunnan and Guizhou, and the Tibet Autonomous Region., The petrochemical industry is concerned with the production and trade of petrochemicals. It directly interfaces with the petroleum industry, especially the downstream sector. A major part is constituted by the plastics (polymer) industry., Tianjin, formerly romanized as Tientsin, is a metropolis in northern coastal Mainland China, administered by the People's Republic of China and one of the five national central cities of China, with a total municipal population of 15,469,500. It is governed as one of the four direct-controlled municipalities of the PRC and is thus under direct administration of the central government. Tianjin borders Hebei Province and Beijing Municipality, bounded to the east by the Bohai Gulf portion of the Yellow Sea. Part of the Bohai Economic Rim, it is the largest coastal city in northern China., China National Highway 212 ( G212 ) runs from Lanzhou in Gansu to Chongqing . It is 1302 kilometres in length . The section from Lanzhou to Lintao has been converted into an expressway , designated G75 ( the Linhai Expressway ) . From Lanzhou to the junction at Huichuan Town ( 35 or so km south of Lintao ) , G212 also doubles as China National Highway 316 ., The Yellow River or Huang He is the second-longest river in Asia, following the Yangtze River, and the sixth-longest river system in the world at the estimated length of . Originating in the Bayan Har Mountains in Qinghai province of western China, it flows through nine provinces, and it empties into the Bohai Sea near the city of Dongying in Shandong province. The Yellow River basin has an eastwest extent of about and a northsouth extent of about . Its total basin area is about ., Shanghai (": Zånhae" ), often abbreviated as Hu or Shen, is one of the four direct-controlled municipalities of the People's Republic of China. It is the most populous city proper in the world, with a population of more than 24 million . It is a global financial centre and transport hub, with the world's busiest container port. Located in the Yangtze River Delta in East China, Shanghai sits on the south edge of the mouth of the Yangtze in the middle portion of the Chinese coast. The municipality borders the provinces of Jiangsu and Zhejiang to the north, south and west, and is bounded to the east by the East China Sea., Heavy industry is industry that involves one or more characteristics such as large and heavy products; large and heavy equipment and facilities (such as heavy equipment, large machine tools, and huge buildings); or complex of numerous processes. Because of those factors, heavy industry involves higher capital intensity than light industry does, and it is also often more heavily cyclical in investment and employment., Gansu (Xiao'erjing:   "Gansw") is a province of the People's Republic of China, located in the northwest of the country., Lanzhou is the capital and largest city of Gansu Province in Northwest China. The prefecture-level city, located on the banks of the Yellow River, is a key regional transportation hub, connecting areas further west by rail to the eastern half of the country. Historically, it has been a major link on the Northern Silk Road. The city is also a center for heavy industry and petrochemical industry. Lanzhou was previously ranked as one of the cities with the worst air quality in the world, due to industrial pollution and its situation in a narrow river valley. However, it was awarded China's climate progress title. As a city once unable to be spotted from satellites, Lanzhou has taken various measures to combat air pollution in recent years, having reduced its Air Pollution Index at the fastest speed across China., Petrochemicals, also called petroleum distillates, are chemical products derived from petroleum. Some chemical compounds made from petroleum are also obtained from other fossil fuels, such as coal or natural gas, or renewable sources such as corn or sugar cane., A prefectural-level municipality, prefectural-level city or prefectural city is an administrative division of the People's Republic of China (PRC), ranking below a province and above a county in China's administrative structure. Prefectural level cities form the second level of the administrative structure (alongside prefectures, leagues and autonomous prefectures). Administrative chiefs (mayors) of prefectural level cities generally have the same rank as a division chief of a national ministry. Since the 1980s, most former prefectures have been renamed into prefectural level cities., Xiao'erjing or Xiao'erjin or Xiaor jin or in its shortened form, Xiaojing, literally meaning "children's script" or "minor script" (cf. "original script" referring to the original Perso-Arabic script, , Xiao'erjing: ; /Benjin), is the practice of writing Sinitic languages such as Mandarin (especially the Lanyin, Zhongyuan and Northeastern dialects) or the Dungan language in the Perso-Arabic Script. It is used on occasion by many ethnic minorities who adhere to the Islamic faith in China (mostly the Hui, but also the Dongxiang, and the Salar), and formerly by their Dungan descendants in Central Asia. Soviet writing reforms forced the Dungan to replace Xiao'erjing with a Roman alphabet and later a Cyrillic alphabet, which they continue to use up until today., China, officially the People's Republic of China (PRC), is a unitary sovereign state in East Asia. With a population of over 1.381 billion, it is the world's most populous country. The state is governed by the Communist Party of China, and its capital is Beijing. It exercises jurisdiction over 22 provinces, five autonomous regions, four direct-controlled municipalities (Beijing, Tianjin, Shanghai, and Chongqing), and two mostly self-governing special administrative regions (Hong Kong and Macau), and claims sovereignty over Taiwan. The country's major urban areas include Shanghai, Guangzhou, Beijing, Chongqing, Shenzhen, Tianjin and Hong Kong. China is a great power and a major regional power within Asia, and has been characterized as a potential superpower., Subject: china national highway 212, Relation: instance_of, Options: (A) administration (B) air pollution (C) area (D) capital (E) chemical (F) city (G) climate (H) combat (I) communist party (J) complex (K) country (L) desert (M) exchange (N) four (O) gas (P) government (Q) gulf (R) heavy equipment (S) index (T) industry (U) jurisdiction (V) key (W) language (X) metropolis (Y) metropolitan (Z) military ([) millennium (\) municipality (]) part (^) people (_) plastics (`) population (a) port (b) practice (c) production (d) province (e) rank (f) region (g) republic (h) river (i) road (j) route (k) script (l) system (m) three (n) title (o) trade (p) transport (q) transport hub
Output: road