Problem: Extract the answer to the question from the following context. Question: How does changing vowel length effect words? Context: Vowel length is not always considered a distinctive feature in Dutch phonology, because it normally co-occurs with changes in vowel quality. One feature or the other may be considered redundant, and some phonemic analyses prefer to treat it as an opposition of tenseness. However, even if not considered part of the phonemic opposition, the long/tense vowels are still realised as phonetically longer than their short counterparts. The changes in vowel quality are also not always the same in all dialects, and in some there may be little difference at all, with length remaining the primary distinguishing feature. And while it is true that older words always pair vowel length with a change in vowel quality, new loanwords have reintroduced phonemic oppositions of length. Compare zonne(n) [zn] ("suns") versus zone [zn] ("zone") versus zonen [zon(n)] ("sons"), or kroes [krus] ("mug") versus cruise [krus] ("cruise").

A: some phonemic analyses prefer to treat it as an opposition of tenseness

Problem: Extract the answer to the question from the following context. Question: What is evidence of the American civilizations' scientific skills? Context: According to both indigenous American and European accounts and documents, American civilizations at the time of European encounter had achieved many accomplishments. For instance, the Aztecs built one of the largest cities in the world, Tenochtitlan, the ancient site of Mexico City, with an estimated population of 200,000. American civilizations also displayed impressive accomplishments in astronomy and mathematics. The domestication of maize or corn required thousands of years of selective breeding.

A: The domestication of maize or corn

Problem: Extract the answer to the question from the following context. Question: What happens at the beginning of a meeting? Context: Meetings for worship and study are held at Kingdom Halls, which are typically functional in character, and do not contain religious symbols. Witnesses are assigned to a congregation in whose "territory" they usually reside and attend weekly services they refer to as "meetings" as scheduled by congregation elders. The meetings are largely devoted to study of Watch Tower Society literature and the Bible. The format of the meetings is established by the religion's headquarters, and the subject matter for most meetings is the same worldwide. Congregations meet for two sessions each week comprising five distinct meetings that total about three-and-a-half hours, typically gathering mid-week (three meetings) and on the weekend (two meetings). Prior to 2009, congregations met three times each week; these meetings were condensed, with the intention that members dedicate an evening for "family worship". Gatherings are opened and closed with kingdom songs (hymns) and brief prayers. Twice each year, Witnesses from a number of congregations that form a "circuit" gather for a one-day assembly. Larger groups of congregations meet once a year for a three-day "regional convention", usually at rented stadiums or auditoriums. Their most important and solemn event is the commemoration of the "Lord's Evening Meal", or "Memorial of Christ's Death" on the date of the Jewish Passover.

A: kingdom songs (hymns) and brief prayers

Problem: Extract the answer to the question from the following context. Question: Which were there more of: assembly seats or times Virbhadra Singh held the top office in Himachal? Context: In the assembly elections held in November 2012, the Congress secured an absolute majority. The Congress won 36 of the 68 seats while the BJP won only 26 of the 68 seats. Virbhadra Singh was sworn-in as Himachal Pradesh's Chief Minister for a record sixth term in Shimla on 25 December 2012. Virbhadra Singh who has held the top office in Himachal five times in the past, was administered the oath of office and secrecy by Governor Urmila Singh at an open ceremony at the historic Ridge Maidan in Shimla.

A:
seats