Problem: Extract the answer to the question from the following context. Question: How would you know if the specific DNA pairs would work? Context: Two chains of DNA twist around each other to form a DNA double helix with the phosphate-sugar backbone spiralling around the outside, and the bases pointing inwards with adenine base pairing to thymine and guanine to cytosine. The specificity of base pairing occurs because adenine and thymine align form two hydrogen bonds, whereas cytosine and guanine form three hydrogen bonds. The two strands in a double helix must therefore be complementary, with their sequence of bases matching such that the adenines of one strand are paired with the thymines of the other strand, and so on.:4.1

A: their sequence of bases matching
Problem: Given the question: Extract the answer to the question from the following context. Question: What started being utilized at the most recent turn of the millennium? Context: The BeiDou Navigation Satellite System (BDS, simplified Chinese: ; traditional Chinese: ; pinyin: Beidou weixing daohang xitong) is a Chinese satellite navigation system. It consists of two separate satellite constellations a limited test system that has been operating since 2000, and a full-scale global navigation system that is currently under construction.
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The answer is:
Chinese satellite navigation system
input question: Extract the answer to the question from the following context. Question: How many stations are there including those that are at ground level? Context: The Delhi Metro is a rapid transit system serving New Delhi, Delhi, Gurgaon, Faridabad, Noida, and Ghaziabad in the National Capital Region of India. Delhi Metro is the world's 12th largest metro system in terms of length. Delhi Metro was India's first modern public transportation system, which had revolutionised travel by providing a fast, reliable, safe, and comfortable means of transport. The network consists of six lines with a total length of 189.63 kilometres (117.83 miles) with 142 stations, of which 35 are underground, five are at-grade, and the remainder are elevated. All stations have escalators, elevators, and tactile tiles to guide the visually impaired from station entrances to trains. It has a combination of elevated, at-grade, and underground lines, and uses both broad gauge and standard gauge rolling stock. Four types of rolling stock are used: Mitsubishi-ROTEM Broad gauge, Bombardier MOVIA, Mitsubishi-ROTEM Standard gauge, and CAF Beasain Standard gauge.???
output answer: 142
Extract the answer to the question from the following context. Question: If I break my arm where should I go? Context: Health care and emergency medical service in the city of Paris and its suburbs are provided by the Assistance publique - Hopitaux de Paris (AP-HP), a public hospital system that employs more than 90,000 people (including practitioners, support personnel, and administrators) in 44 hospitals. It is the largest hospital system in Europe. It provides health care, teaching, research, prevention, education and emergency medical service in 52 branches of medicine. The hospitals receive more than 5.8 million annual patient visits.
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Answer: Assistance publique - Hopitaux de Paris (AP-HP)
Q: Extract the answer to the question from the following context. Question: Accessories and games comes with? Context: The NES Test Station's front features a Game Pak slot and connectors for testing various components (AC adapter, RF switch, Audio/Video cable, NES Control Deck, accessories and games), with a centrally-located selector knob to chose which component to test. The unit itself weighs approximately 11.7 pounds without a TV. It connects to a television via a combined A/V and RF Switch cable. By actuating the green button, a user can toggle between an A/V Cable or RF Switch connection. The television it is connected to (typically 11" to 14") is meant to be placed atop it.
A: The NES Test Station's front features
[Q]: Extract the answer to the question from the following context. Question: __ is a phylum of unsegmented marine worms Context: The Ecdysozoa are protostomes, named after the common trait of growth by moulting or ecdysis. The largest animal phylum belongs here, the Arthropoda, including insects, spiders, crabs, and their kin. All these organisms have a body divided into repeating segments, typically with paired appendages. Two smaller phyla, the Onychophora and Tardigrada, are close relatives of the arthropods and share these traits. The ecdysozoans also include the Nematoda or roundworms, perhaps the second largest animal phylum. Roundworms are typically microscopic, and occur in nearly every environment where there is water. A number are important parasites. Smaller phyla related to them are the Nematomorpha or horsehair worms, and the Kinorhyncha, Priapulida, and Loricifera. These groups have a reduced coelom, called a pseudocoelom.
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[A]:
Priapulida