instruction:
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.
question:
Passage: Apollo and his sister Artemis can bring death with their arrows. The conception that diseases and death come from invisible shots sent by supernatural beings, or magicians is common in Germanic and Norse mythology. In Greek mythology Artemis was the leader (, "hegemon") of the nymphs, who had similar functions with the Nordic Elves. The "elf-shot" originally indicated disease or death attributed to the elves, but it was later attested denoting stone arrow-heads which were used by witches to harm people, and also for healing rituals. Question: Who is Apollo's sister?
answer:
Artemis

question:
Passage: While many secular buildings exist from the Late Middle Ages, it is in the buildings of cathedrals and great churches that Gothic architecture displays its pertinent structures and characteristics to the fullest advantage. A Gothic cathedral or abbey was, prior to the 20th century, generally the landmark building in its town, rising high above all the domestic structures and often surmounted by one or more towers and pinnacles and perhaps tall spires. These cathedrals were the skyscrapers of that day and would have been the largest buildings by far that Europeans would ever have seen. It is in the architecture of these Gothic churches that a unique combination of existing technologies established the emergence of a new building style. Those technologies were the ogival or pointed arch, the ribbed vault, and the buttress. Question: What is another name for the pointed arch?
answer:
the ogival

question:
Passage: The house which forms the architectural core of the palace was built for the first Duke of Buckingham and Normanby in 1703 to the design of William Winde. The style chosen was of a large, three-floored central block with two smaller flanking service wings. Buckingham House was eventually sold by Buckingham's descendant, Sir Charles Sheffield, in 1761 to George III for 21,000. Sheffield's leasehold on the mulberry garden site, the freehold of which was still owned by the royal family, was due to expire in 1774. Question: How many flanking service wings did the original Buckingham House have?
answer:
two