Problem: Please answer a question about the following article about Light-emitting diode:
Assistive listening devices in many theaters and similar spaces use arrays of infrared LEDs to send sound to listeners' receivers. Light-emitting diodes (as well as semiconductor lasers) are used to send data over many types of fiber optic cable, from digital audio over TOSLINK cables to the very high bandwidth fiber links that form the Internet backbone. For some time, computers were commonly equipped with IrDA interfaces, which allowed them to send and receive data to nearby machines via infrared.
How are LEDs used in theaters?
A: to send sound to listeners' receivers
Problem: Please answer a question about the following article about Myanmar:
Though the country's foreign relations, particularly with Western nations, have been strained, relations have thawed since the reforms following the 2010 elections. After years of diplomatic isolation and economic and military sanctions, the United States relaxed curbs on foreign aid to Myanmar in November 2011 and announced the resumption of diplomatic relations on 13 January 2012 The European Union has placed sanctions on Myanmar, including an arms embargo, cessation of trade preferences, and suspension of all aid with the exception of humanitarian aid.
How did the United States treat Myanmar prior to the changes made in Burmese government ? 
A: years of diplomatic isolation and economic and military sanctions
Problem: Please answer a question about the following article about Black people:
According to the Office for National Statistics, at the 2001 census there were over a million black people in the United Kingdom; 1% of the total population described themselves as "Black Caribbean", 0.8% as "Black African", and 0.2% as "Black other". Britain encouraged the immigration of workers from the Caribbean after World War II; the first symbolic movement was those who came on the ship the Empire Windrush. The preferred official umbrella term is "black and minority ethnic" (BME), but sometimes the term "black" is used on its own, to express unified opposition to racism, as in the Southall Black Sisters, which started with a mainly British Asian constituency, and the National Black Police Association, which has a membership of "African, African-Caribbean and Asian origin".
When did Britain encourage immigration of workers?
A: after World War II
Problem: Please answer a question about the following article about House music:
It was during this decade that vocal house became firmly established, both in the underground and as part of the pop market, and labels such as Defected Records, Roule and Om were at the forefront of championing the emerging sound. In the mid-2000s, fusion genres such as electro house and fidget house emerged.[citation needed] This fusion is apparent in the crossover of musical styles by artists such as Dennis Ferrer and Booka Shade, with the former's production style having evolved from the New York soulful house scene and the latter's roots in techno.
Roule and Om was at the forefront of what type of house music?
A:
vocal house