input: Please answer the following: Extract the answer to the question from the following context. Question: What is the organometallic precursor for the Grignard reaction? Context: There are many important organozinc compounds. Organozinc chemistry is the science of organozinc compounds describing their physical properties, synthesis and reactions. Among important applications is the Frankland-Duppa Reaction in which an oxalate ester(ROCOCOOR) reacts with an alkyl halide R'X, zinc and hydrochloric acid to the -hydroxycarboxylic esters RR'COHCOOR, the Reformatskii reaction which converts -halo-esters and aldehydes to -hydroxy-esters, the SimmonsSmith reaction in which the carbenoid (iodomethyl)zinc iodide reacts with alkene(or alkyne) and converts them to cyclopropane, the Addition reaction of organozinc compounds to carbonyl compounds. The Barbier reaction (1899) is the zinc equivalent of the magnesium Grignard reaction and is better of the two. In presence of just about any water the formation of the organomagnesium halide will fail, whereas the Barbier reaction can even take place in water. On the downside organozincs are much less nucleophilic than Grignards, are expensive and difficult to handle. Commercially available diorganozinc compounds are dimethylzinc, diethylzinc and diphenylzinc. In one study the active organozinc compound is obtained from much cheaper organobromine precursors:
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output: organomagnesium

Please answer this: Extract the answer to the question from the following context. Question: Where is the castle located? Context: Ganondorf then revives, and Midna teleports Link and Zelda outside the castle so she can hold him off with the Fused Shadows. However, as Hyrule Castle collapses, it is revealed that Ganondorf was victorious as he crushes Midna's helmet. Ganondorf engages Link on horseback, and, assisted by Zelda and the Light Spirits, Link eventually knocks Ganondorf off his horse and they duel on foot before Link strikes down Ganondorf and plunges the Master Sword into his chest. With Ganondorf dead, the Light Spirits not only bring Midna back to life, but restore her to her true form. After bidding farewell to Link and Zelda, Midna returns home before destroying the Mirror of Twilight with a tear to maintain balance between Hyrule and the Twilight Realm. Near the end, as Hyrule Castle is rebuilt, Link is shown leaving Ordon Village heading to parts unknown.
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Answer: Hyrule

Problem: Extract the answer to the question from the following context. Question: Where can you find acknowledgments given to players outside the college circuit? Context: Notre Dame rose to national prominence in the early 1900s for its Fighting Irish football team, especially under the guidance of the legendary coach Knute Rockne. The university's athletic teams are members of the NCAA Division I and are known collectively as the Fighting Irish. The football team, an Independent, has accumulated eleven consensus national championships, seven Heisman Trophy winners, 62 members in the College Football Hall of Fame and 13 members in the Pro Football Hall of Fame and is considered one of the most famed and successful college football teams in history. Other ND teams, chiefly in the Atlantic Coast Conference, have accumulated 16 national championships. The Notre Dame Victory March is often regarded as the most famous and recognizable collegiate fight song.

A: Pro Football Hall of Fame

Problem: Given the question: Extract the answer to the question from the following context. Question: How was the hyacinth flower made? Context: Hyacinth or Hyacinthus was one of Apollo's male lovers. He was a Spartan prince, beautiful and athletic. The pair was practicing throwing the discus when a discus thrown by Apollo was blown off course by the jealous Zephyrus and struck Hyacinthus in the head, killing him instantly. Apollo is said to be filled with grief: out of Hyacinthus' blood, Apollo created a flower named after him as a memorial to his death, and his tears stained the flower petals with the interjection , meaning alas. The Festival of Hyacinthus was a celebration of Sparta.
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The answer is:
out of Hyacinthus' blood

input question: Extract the answer to the question from the following context. Question: What can a canine's olfactory glands do? Context: Anthropologists believe the most significant benefit would have been the use of dogs' robust sense of smell to assist with the hunt. The relationship between the presence of a dog and success in the hunt is often mentioned as a primary reason for the domestication of the wolf, and a 2004 study of hunter groups with and without a dog gives quantitative support to the hypothesis that the benefits of cooperative hunting was an important factor in wolf domestication.???
output answer: assist with the hunt

input question: Extract the answer to the question from the following context. Question: What else should be watched for? Context: Shortness of breath occurs when the damage to the heart limits the output of the left ventricle, causing left ventricular failure and consequent pulmonary edema. Other symptoms include diaphoresis (an excessive form of sweating), weakness, light-headedness, nausea, vomiting, and palpitations. These symptoms are likely induced by a massive surge of catecholamines from the sympathetic nervous system, which occurs in response to pain and the blood flow abnormalities that result from dysfunction of the heart muscle. Loss of consciousness (due to inadequate blood flow to the brain and cardiogenic shock) and sudden death (frequently due to the development of ventricular fibrillation) can occur in MIs.???
output answer:
Other symptoms include diaphoresis (an excessive form of sweating), weakness, light-headedness, nausea, vomiting, and palpitations