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: Where does the body of water where Dr. Nelson G. Blalock established an agricultural operation originate? Passage 1:Brown was born on 15 April 1948, in Tangier, Morocco. His father flew Spitfires during World War II and joined civil aviation in the post war period, flying for Gibraltar Airways and British European Airways. He was educated at Merchant Taylors' School, an all-boys public school in Hertfordshire. He then matriculated into St Catherine's College, Oxford to study history. In 1966, he graduated from the University of Oxford with a Bachelor of Arts (BA) degree in Modern History. This was later promoted to Master of Arts (MA Oxon) as per tradition. He remained at St Catherine's to complete a Diploma in Art History. He then undertook post-graduate research at the Courtauld Institute of Art and completed his Doctor of Philosophy (PhD) degree.
Passage 2:He had an exceptional gift for languages and mastered Latin and Greek very early; in his edition of Rhodanthe et Dosicles, he included a Greek poem that he wrote when he was 16 years old. In 1615, his friend Jacques-Philippe de Maussac, in dedicating his De lapidum virtutibus to Gaulmin, called him a "pentaglot," knowing, besides Latin and Greek, Hebrew, Arabic, and Turkish. In 1639, Scottish mathematician James Hume, comparing Gaulmin to Pico della Mirandola, praised him for also knowing Persian and Armenian. In 1648, Balthazar Gerbier also credited him with the knowledge of Italian and Spanish. He learned Arabic first with Etienne Hubert, royal physician and professor of Arabic at the College de France, and then under Gabriel Sionita, a Maronite who arrived in Paris in 1614 and who succeeded Hubert. Gaulmin was taught Hebrew by a converted Jewish man, Philippe d'Aquin, who in 1610 was named a professor of Hebrew at the College de France. A letter from Nicolas-Claude Fabri de Peiresc, dated 1635, indicates that Gaulmin had at his service "Hazard, student from Lebanon" ("le sieur Hazard, estudiant au mont Liban"), the last name also spelled "Hazand," "Hazaed," or "Hazaid"; the name of the author indicated in the translation of the Livre des lumieres ("David Sahid of Ispahan, capital city of Persia) is doubtless that of this man.
Passage 3:The community was named for the farm of Dr. Nelson G. Blalock, a Civil War veteran who had pioneered in the Walla Walla area. He established an agricultural operation of several thousand acres on the flat land here along the Columbia River. The area was first settled in 1879, and Blalock post office was established in 1881. The town was platted in 1881 by the Blalock Wheat Growing Company. The first two buildings, a railroad station and a warehouse, were built by A. J. McLellan, OR&N superintendent of the construction of bridges and buildings. By 1884, the community was shipping wheat and there were daily stagecoaches to Heppner; the population was 50. People and businesses listed in the Polk Directory at that time included two clergymen, a saloon, a wagonmaker, a ferryman, a hotel, a general store, a lawyer, and a dealer in lumber, coal, and feed. In 1904, the town handled about 750,000 bushels of wheat. By 1905, the town had two grain warehouses, a hotel, a general store, a livery and stage stable, a real estate office and an agricultural implement factory. In 1940, Blalock had a population of 19. The post office closed in 1959. In 1968, the community was inundated by the backwaters from the John Day Dam.

Output:
3