In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.

Input: Consider Input: Passage: The origins of the Early Netherlandish school lie in the miniature paintings of the late Gothic period.  This was first seen in manuscript illumination, which after 1380 conveyed new levels of realism, perspective and skill in rendering colour, peaking with the Limbourg brothers and the Netherlandish artist known as Hand G, to whom the most significant leaves of the Turin-Milan Hours are usually attributed. Although his identity has not been definitively established, Hand G, who contributed c. 1420, is thought to have been either Jan van Eyck or his brother Hubert. According to Georges Hulin de Loo, Hand G's contributions to the Turin-Milan Hours "constitute the most marvelous group of paintings that have ever decorated any book, and, for their period, the most astounding work known to the history of art".Jan van Eyck's use of oil as a medium was a significant development, allowing artists far greater manipulation of paint. The 16th-century art historian Giorgio Vasari claimed van Eyck invented the use of oil paint; a claim that, while exaggerated, indicates the extent to which van Eyck helped disseminate the technique. Van Eyck employed a new level of virtuosity, mainly from taking advantage of the fact that oil dries so slowly; this gave him more time and more scope for blending and mixing layers of different pigments, and his technique was quickly adopted and refined by both Robert Campin and Rogier van der Weyden. These three artists are considered the first rank and most influential of the early generation of Early Netherlandish painters. Their influence was felt across northern Europe, from Bohemia and Poland in the east to Austria and Swabia in the south. 
Question: What are the last names of the three artists who are considered the first rank and most influential of the early generation of Early Netherlandish painters?

Output: Van Eyck.


Input: Consider Input: Passage: William Etty  (10 March 1787 – 13 November 1849) was an English artist best known for his history paintings containing nude figures. He was the first significant British painter of nudes and still lifes. Born in York, he left school at the age of 12 to become an apprentice printer in Hull. He completed his apprenticeship seven years later and moved to London, where in 1807 he joined the Royal Academy Schools. There he studied under Thomas Lawrence and trained by copying works by other artists. Etty earned respect at the Royal Academy of Arts for his ability to paint realistic flesh tones, but had little commercial or critical success in his first few years in London.
Etty's Cleopatra's Arrival in Cilicia, painted in 1821, featured numerous nudes and was exhibited to great acclaim. Its success prompted several further depictions of historical scenes with nudes. All but one of the works he exhibited at the Royal Academy in the 1820s contained at least one nude figure, and he acquired a reputation for indecency. Despite this, he was commercially successful and critically acclaimed, and in 1828 was elected a Royal Academician, at the time the highest honour available to an artist. Although he was one of the most respected artists in the country he continued to study at life classes throughout his life, a practice considered inappropriate by his fellow artists. In the 1830s Etty began to branch out into the more lucrative but less respected field of portraiture, and later became the first English painter to paint significant still lifes. He continued to paint both male and female nudes, which caused severe criticism and condemnation from some elements of the press.
An extremely shy man, Etty rarely socialised and never married. From 1824 until his death he lived with his niece Betsy (Elizabeth Etty). Even in London he retained a keen interest in his native York, and was instrumental in the establishment of the town's first art school and the campaign to preserve York city walls. While he never formally converted from his Methodist faith, he was deeply attached to the Roman Catholic Church and was one of the few non-Catholics to attend the 1838 opening of Augustus Pugin's chapel for St Mary's College, Oscott, at that time England's most important Roman Catholic building. 
Question: What church was the artist who was the first significant painter of nudes deeply attached to?

Output: Roman Catholic Church.


Input: Consider Input: Passage: The Manhattan Project was a research and development undertaking during World War II that produced the first nuclear weapons. It was led by the United States with the support of the United Kingdom and Canada. From 1942 to 1946, the project was under the direction of Major General Leslie Groves of the U.S. Army Corps of Engineers. Nuclear physicist Robert Oppenheimer was the director of the Los Alamos Laboratory that designed the actual bombs. The Army component of the project was designated the Manhattan District; Manhattan gradually superseded the official codename, Development of Substitute Materials, for the entire project. Along the way, the project absorbed its earlier British counterpart, Tube Alloys. The Manhattan Project began modestly in 1939, but grew to employ more than 130,000 people and cost nearly US$2 billion (about $23 billion in 2018 dollars). Over 90% of the cost was for building factories and to produce fissile material, with less than 10% for development and production of the weapons. Research and production took place at more than 30 sites across the United States, the United Kingdom, and Canada.
Two types of atomic bombs were developed concurrently during the war: a relatively simple gun-type fission weapon and a more complex implosion-type nuclear weapon. The Thin Man gun-type design proved impractical to use with plutonium, and therefore a simpler gun-type called Little Boy was developed that used uranium-235, an isotope that makes up only 0.7 percent of natural uranium. Chemically identical to the most common isotope, uranium-238, and with almost the same mass, it proved difficult to separate the two. Three methods were employed for uranium enrichment: electromagnetic, gaseous and thermal. Most of this work was performed at the Clinton Engineer Works at Oak Ridge, Tennessee.
In parallel with the work on uranium was an effort to produce plutonium. After the feasibility of the world's first artificial nuclear reactor was demonstrated in Chicago at the Metallurgical Laboratory, it designed the X-10 Graphite Reactor at Oak Ridge and the production reactors in Hanford, Washington, in which uranium was irradiated and transmuted into plutonium. The plutonium was then chemically separated from the uranium, using the bismuth phosphate process. The Fat Man plutonium implosion-type weapon was developed in a concerted design and development effort by the Los Alamos Laboratory.
The project was also charged with gathering intelligence on the German nuclear weapon project. Through Operation Alsos, Manhattan Project personnel served in Europe, sometimes behind enemy lines, where they gathered nuclear materials and documents, and rounded up German scientists. Despite the Manhattan Project's tight security, Soviet atomic spies successfully penetrated the program. 
Question: What isotope had almost the same mass as uranium-238?


Output: uranium-235.