Here is a question about this article: Back in Warsaw that year, Chopin heard Niccolo Paganini play the violin, and composed a set of variations, Souvenir de Paganini. It may have been this experience which encouraged him to commence writing his first Etudes, (182932), exploring the capacities of his own instrument. On 11 August, three weeks after completing his studies at the Warsaw Conservatory, he made his debut in Vienna. He gave two piano concerts and received many favourable reviewsin addition to some commenting (in Chopin's own words) that he was "too delicate for those accustomed to the piano-bashing of local artists". In one of these concerts, he premiered his Variations on La ci darem la mano, Op. 2 (variations on an aria from Mozart's opera Don Giovanni) for piano and orchestra. He returned to Warsaw in September 1829, where he premiered his Piano Concerto No. 2 in F minor, Op. 21 on 17 March 1830.
What is the answer to this question: During what month did Frederic make his first appearance in Vienna?
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So... August

The problem: Answer a question about this article:
In 1989, CBS Records re-entered the music publishing business by acquiring Nashville music publisher Tree International Publishing for more than $30 million.
In what year did CBS Records buy out Tree International Publishing?
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The answer: 1989

Problem: Please answer a question about the following article about Light-emitting diode:
White LEDs can also be made by coating near-ultraviolet (NUV) LEDs with a mixture of high-efficiency europium-based phosphors that emit red and blue, plus copper and aluminium-doped zinc sulfide (ZnS:Cu, Al) that emits green. This is a method analogous to the way fluorescent lamps work. This method is less efficient than blue LEDs with YAG:Ce phosphor, as the Stokes shift is larger, so more energy is converted to heat, but yields light with better spectral characteristics, which render color better. Due to the higher radiative output of the ultraviolet LEDs than of the blue ones, both methods offer comparable brightness. A concern is that UV light may leak from a malfunctioning light source and cause harm to human eyes or skin.
What light can harm human eyes or skin?
A: UV light

Question: Read this and answer the question

Although Calvin and Huldrych Zwingli honored Mary as the Mother of God in the 16th century, they did so less than Martin Luther. Thus the idea of respect and high honor for Mary was not rejected by the first Protestants; but, they came to criticize the Roman Catholics for venerating Mary. Following the Council of Trent in the 16th century, as Marian veneration became associated with Catholics, Protestant interest in Mary decreased. During the Age of the Enlightenment any residual interest in Mary within Protestant churches almost disappeared, although Anglicans and Lutherans continued to honor her.

In which century did the Council of Trent occur?
Answer: 16th

Problem: Fighting on one side was a coalition of forces including the Republic of Vietnam (South Vietnam or the "RVN"), the United States, supplemented by South Korea, Thailand, Australia, New Zealand, and the Philippines. The allies fought against the North Vietnamese Army (NVA) as well as the National Liberation Front (NLF, also known as Viet communists Viet Cong), or "VC", a guerrilla force within South Vietnam. The NVA received substantial military and economic aid from the Soviet Union and China, turning Vietnam into a proxy war.
By what name were fighters of the National Liberation Front known?
The answer is the following: Viet Cong

Input: Article: The most extreme case was the Soviet Union, and this model may still be followed in some countries: it was a separate service, on a par with the navy or ground force. In the Soviet Union this was called Voyska PVO, and had both fighter aircraft and ground-based systems. This was divided into two arms, PVO Strany, the Strategic Air defence Service responsible for Air Defence of the Homeland, created in 1941 and becoming an independent service in 1954, and PVO SV, Air Defence of the Ground Forces. Subsequently these became part of the air force and ground forces respectively

Now answer this question: What year did the PVO Strany become independent?

Output:
1954