Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

[EX Q]: Context: Australia is the smallest continent in the world. It is a little smaller than China. It is on the Southern Hemisphere of the earth. Australia is big, but its population is small. The population of Australia is nearly as large as that of Shanghai. Enough laws have been made to fight against pollution. The cities in Australia have little air or water pollution. The sky is blue and the water is clean. You can clearly see fish in the rivers. Plants grow very well. Last month we visited Perth, the biggest city in Western Australia, and went to a wild flower _ . There we saw large numbers of wild flowers on show, most of which we had never seen before. We had a wonderful time. Perth is famous for its beautiful wild flowers. Every year in spring Perth has wild flower exhibitions. After visiting Perth, we spent a day in the countryside. We sat down and had a rest near a path at the foot of a hill. It was quiet and we enjoyed ourselves very much. When we heard bells ringing at the top of the hill, we looked up, but what we saw made us pick up all our things and run back to our car as quickly as we could. There were about three hundred sheep coming towards us along the path. Australia is famous for its sheep and kangaroos . After a short drive from any town, you will find yourself among the white sheep. Sheep, sheep, everywhere you can see sheep. 
 Question: Which country is the writer most possibly from?
[EX A]: china

[EX Q]: Context: The median age in the city was 35.1 years. 24.2% of residents were under the age of 18; 7.9% were between the ages of 18 and 24; 33.8% were from 25 to 44; 24.6% were from 45 to 64; and 9.5% were 65 years of age or older. The gender makeup of the city was 48.6% male and 51.4% females. 
 Question: Which age group is larger: under the age of 18 or 18 and 24?
[EX A]: under the age of 18

[EX Q]: Context: Restriction endonucleases play a very important role in genetic engineering and DNA mapping. Among hundreds of restriction endonucleases, the Eco R1 enzyme is the most useful and widely investigated enzyme. After sonication and ultracentrifugation, crude extracts of E. coli RY 13 were purified by employing the polyethyleneimine precipitate, ammonium sulfate precipitate and heparin Sepharose-4B affinity column chromatography. The Eco R1 enzyme were purified at about 42 folds and the specific activity was about 100,000 U/mg of protein. The whole purification procedure was finished within two days. The recovery was about 42%. The enzyme was sufficiently concentrated for direct specific DNA hydrolysis. 
 Question: Which bacteria was EcoRI, restriction endonuclease isolated from?
[EX A]:
e coli