Definition: In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.
Input: Question: In what year did the Nordic Passport Union begin? Passage 1:The term entered common usage during the era of Deng Xiaoping and was largely associated with Deng's overall program of adopting elements of market economics as a means to foster growth using foreign investment and to increase productivity (especially in the countryside where 80% of China's population lived) while the Communist Party of China retained both its formal commitment to achieve communism and its monopoly on political power. In the party's official narrative, socialism with Chinese characteristics is Marxism–Leninism adapted to Chinese conditions and a product of scientific socialism. The theory stipulated that China was in the primary stage of socialism due to its relatively low level of material wealth and needed to engage in economic growth before it pursued a more egalitarian form of socialism, which in turn would lead to a communist society described in Marxist orthodoxy.
 Passage 2:A legal purge took place in Norway after WWII in which 53,000 people were sentenced for treason and 25 were executed. The post-war years saw an increased interest in Scandinavism, resulting in Scandinavian Airlines System in 1946, the Nordic Council in 1952 and the Nordic Passport Union along with the metric system being introduced. Reconstruction after the war gave Norway the highest economic growth in Europe until 1950, partly created through rationing private consumption allowing for higher industrial investments. The Labor Party retained power throughout the period and maintained a policy of public planning. The University of Bergen was created in 1946. The 1950s saw a boom in construction of hydroelectricity and the state built the steel mill Norsk Jernverk and two aluminum works. State banks such as the State Housing Bank, the State Educational Loan Fund and Postbanken allowed for governmental control over private debt. Oslo hosted the 1952 Winter Olympics.
 Passage 3:Waller was born on July 17, 1846. His parents were David Jewett Waller Sr. and Julia Ellmaker Waller. He was their fifth child. When young he was educated at Bloomsburg. After that he went to a classical school in a local Primitive Methodist Episcopal Church. When Waller was fourteen he was sent to a school run by Revered Gayley in the community of Media. In 1861, at the age of 15, he went to Williams College's preparatory department. However, due to sickness his education ceased for three years. In 1867, he was among the first people to graduate from the Bloomsburg Literary Institute. Waller went to Lafayette College in the autumn of 1867. He did well there and graduated from there with a Bachelor of Arts degree in 1870 and a Master of Arts degree in 1873. From 1870 to 1871 he trained to be and served as a tutor in Latin and Greek. While at Lafayette College he also won the Fowler Prize, a prize of $30 granted for excellence in English philology. Waller attended the Princeton Theological Seminary from 1871 to 1872, then switched to the Union Theological Seminary and graduated from that in 1874. He received an honorary Ph.D from Lafayette College in 1880 and received a Doctor of Divinity degree from Ursinus College in 1892. Juniata College granted Waller an honorary Doctor of Laws degree in 1934.

Output:
2