This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

[EX Q]: Passage: A physical USB device may consist of several logical sub-devices that are referred to as device functions. A single device may provide several functions, for example, a webcam (video device function) with a built-in microphone (audio device function). This kind of device is called a composite device. An alternative to this is compound device, in which the host assigns each logical device a distinctive address and all logical devices connect to a built-in hub that connects to the physical USB cable. Question: What are logical sub-devices referred to as?
[EX A]: device functions

[EX Q]: Passage: The Norfolk Island Legislative Assembly decided to hold a referendum on the proposal. On 8 May 2015, voters were asked if Norfolk Islanders should freely determine their political status and their economic, social and cultural development, and to "be consulted at referendum or plebiscite on the future model of governance for Norfolk Island before such changes are acted upon by the Australian parliament". 68% out of 912 voters voted in favour. The Norfolk Island Chief Minister, Lisle Snell, said that "the referendum results blow a hole in Canberra's assertion that the reforms introduced before the Australian Parliament that propose abolishing the Legislative Assembly and Norfolk Island Parliament were overwhelmingly supported by the people of Norfolk Island". Question: What percentage of Norfolk Island residents voted in favor of self-governance?
[EX A]: 68%

[EX Q]: Passage: Originally known as Buckingham House, the building at the core of today's palace was a large townhouse built for the Duke of Buckingham in 1703 on a site that had been in private ownership for at least 150 years. It was acquired by King George III in 1761 as a private residence for Queen Charlotte and became known as "The Queen's House". During the 19th century it was enlarged, principally by architects John Nash and Edward Blore, who constructed three wings around a central courtyard. Buckingham Palace became the London residence of the British monarch on the accession of Queen Victoria in 1837. Question: Who was Buckingham Palace was originally built for?
[EX A]:
Duke of Buckingham