Instructions: 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: Which of the two extinct birds went extinct first? Passage 1:The spotted green pigeon or Liverpool pigeon (Caloenas maculata) is a species of pigeon which is most likely extinct. It was first mentioned and described in 1783 by John Latham, who had seen two specimens of unknown provenance and a drawing depicting the bird. The taxonomic relationships of the bird were long obscure, and early writers suggested many different possibilities, though the idea that it was related to the Nicobar pigeon (C. nicobarica) prevailed, and it was therefore placed in the same genus, Caloenas. Today, the species is only known from a specimen kept in World Museum, Liverpool. Overlooked for much of the 20th century, it was recognised as a valid extinct species by the IUCN Red List only in 2008. In 2014 a genetic study confirmed it as a distinct species related to the Nicobar pigeon, and showed that the two were the closest relatives of the extinct dodo and Rodrigues solitaire.
 Passage 2:In 1861, Goggin moved back to Virginia, entering the Confederate States Army on July 1, 1861 as a major in the 32nd Virginia Volunteer Infantry Regiment where he was assigned to lead a battalion. Goggin and the 32nd Virginia Infantry served under Maj. Gen. John B. Magruder in 1861 and into 1862 during the Peninsula Campaign. Goggin joined the First Corps, Army of Northern Virginia in April 1862, serving on the staff of Maj. Gen. Lafayette McLaws as his assistant adjutant general. He served in this capacity during all of the First Corps' engagements, in both the Army of Northern Virginia and the Army of Tennessee, until the spring of 1864. During the Battle of Fort Sanders in November 1863, Goggin carried a message from McLaws to Lt. Gen. James Longstreet, informing him that the attack was beginning to fail and it was futile to carry in on. When McLaws was replaced with Maj. Gen. Joseph B. Kershaw in May 1864, Goggin served as his assistant adjutant general as well. His service in this post was highly praised by Goggin's superiors.
 Passage 3:Hercog made her comeback during the clay court season at the Grand Prix SAR La Princesse Lalla Meryem. In the first round, she upset Zhang Shuai 6–2, 6–2. In the second round, she defeated Alison Van Uytvanck 6–1, 6–4. Hercog was then stopped in the quarterfinals by eventual champion María Teresa Torró Flor in two tie-breakers. At the Portugal Open, she beat Stefanie Vögele in the first round. In the second round, she upset sixth seed Lucie Šafářová. Hercog lost in the quarterfinals to top seed and eventual champion, Carla Suárez Navarro. Seeded 6th for qualifying at the Internazionali BNL d'Italia, Hercog lost in the first round of qualifying to Belinda Bencic. Her final tournament before the French Open was the Nürnberger Versicherungscup. In the first round, she upset third seed Klára Koukalová in three sets. In the second round, Hercog lost to Karin Knapp. At the French Open, she defeated Jana Čepelová in the first round In the second round, Hercog was defeated by 15th seed Sloane Stephens 6–1, 6–3.

Output:
1