Input: Read this: The war started badly for the US and UN. North Korean forces struck massively in the summer of 1950 and nearly drove the outnumbered US and ROK defenders into the sea. However the United Nations intervened, naming Douglas MacArthur commander of its forces, and UN-US-ROK forces held a perimeter around Pusan, gaining time for reinforcement. MacArthur, in a bold but risky move, ordered an amphibious invasion well behind the front lines at Inchon, cutting off and routing the North Koreans and quickly crossing the 38th Parallel into North Korea. As UN forces continued to advance toward the Yalu River on the border with Communist China, the Chinese crossed the Yalu River in October and launched a series of surprise attacks that sent the UN forces reeling back across the 38th Parallel. Truman originally wanted a Rollback strategy to unify Korea; after the Chinese successes he settled for a Containment policy to split the country. MacArthur argued for rollback but was fired by President Harry Truman after disputes over the conduct of the war. Peace negotiations dragged on for two years until President Dwight D. Eisenhower threatened China with nuclear weapons; an armistice was quickly reached with the two Koreas remaining divided at the 38th parallel. North and South Korea are still today in a state of war, having never signed a peace treaty, and American forces remain stationed in South Korea as part of American foreign policy.
Question: Chinese troops attacked the UN forces when they crossed what ocean?

Output: unanswerable


Input: Read this: Parisian examples of European architecture date back more than a millennium; including the Romanesque church of the Abbey of Saint-Germain-des-Prés (1014-1163); the early Gothic Architecture of the Basilica of Saint-Denis (1144), the Notre Dame Cathedral (1163-1345), the Flamboyant Gothic of Saint Chapelle (1239-1248), the Baroque churches of Saint-Paul-Saint-Louis (1627-1641) and Les Invalides (1670-1708). The 19th century produced the neoclassical church of La Madeleine (1808-1842); the Palais Garnier Opera House (1875); the neo-Byzantine Basilica of Sacré-Cœur (1875-1919), and the exuberant Belle Époque modernism of the Eiffel Tower (1889). Striking examples of 20th century architecture include the Centre Georges Pompidou by Richard Rogers and Renzo Piano (1977), and the Louvre Pyramid by I.M. Pei (1989). Contemporary architecture includes the Musée du Quai Branly by Jean Nouvel (2006) and the new contemporary art museum of the Louis Vuitton Foundation by Frank Gehry (2014).
Question: When was the Eiffel Tower built?

Output: 1889


Input: Read this: European maps continued to show this hypothesized land until Captain James Cook's ships, HMS Resolution and Adventure, crossed the Antarctic Circle on 17 January 1773, in December 1773 and again in January 1774. Cook came within about 120 km (75 mi) of the Antarctic coast before retreating in the face of field ice in January 1773. The first confirmed sighting of Antarctica can be narrowed down to the crews of ships captained by three individuals. According to various organizations (the National Science Foundation, NASA, the University of California, San Diego, and other sources), ships captained by three men sighted Antarctica or its ice shelf in 1820: von Bellingshausen (a captain in the Imperial Russian Navy), Edward Bransfield (a captain in the Royal Navy), and Nathaniel Palmer (a sealer out of Stonington, Connecticut). The expedition led by von Bellingshausen and Lazarev on the ships Vostok and Mirny reached a point within 32 km (20 mi) from Queen Maud's Land and recorded the sight of an ice shelf at 69°21′28″S 2°14′50″W﻿ / ﻿69.35778°S 2.24722°W﻿ / -69.35778; -2.24722, which became known as the Fimbul ice shelf. This happened three days before Bransfield sighted land, and ten months before Palmer did so in November 1820. The first documented landing on Antarctica was by the American sealer John Davis, apparently at Hughes Bay, near Cape Charles, in West Antarctica on 7 February 1821, although some historians dispute this claim. The first recorded and confirmed landing was at Cape Adair in 1895.
Question: Who came within 120 mi of the Antarctic coast in 1773?

Output: unanswerable


Input: Read this: In response to the publication of the secret protocols and other secret German–Soviet relations documents in the State Department edition Nazi–Soviet Relations (1948), Stalin published Falsifiers of History, which included the claim that, during the Pact's operation, Stalin rejected Hitler's claim to share in a division of the world, without mentioning the Soviet offer to join the Axis. That version persisted, without exception, in historical studies, official accounts, memoirs and textbooks published in the Soviet Union until the Soviet Union's dissolution.
Question: What year wasn't Joseph Stalin’s version of the pact published?

Output:
unanswerable