Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

[EX Q]: New research shows how kids' brains reorganize as they learn math. All the time you spent memorizing multiplication tables may have made you a better mathematician, according to a new study. A team of scientists from Stanford University, in California, have shown how the brain reorganizes itself as kids learn math. After a certain amount of time spent practicing math, kids can put away the calculator . They don't even need to count on their fingers. They simply know the answers to subtraction , addition, and multiplication facts. The quicker kids can recall basic math facts, the easier it is for them to solve more complicated math problems. The Stanford University researchers observed the brain activity of 28 students aged 7to 9 for the study. They took scans of the students' brains as the students solved math calculations without the help of a calculator, pen or paper. A calculation--three plus four equals seven, for example--flashed on a screen. The students pushed a button to say if the answer was right or wrong. The scientists also recorded the response speed, and what parts of the brain became active as the kids pushed the button. These observations showed a process called fact retrieval . Rather than using their fingers to count, or writing out answers on a piece of paper, the students pulled the answers from memory. It's as if the answers to basic math problems are kept in a long-term storage area in the brain, which was built from repetition. "Experience really does matter," said Dr. Kathy Mann Koepeke. Children make the shift from counting to fact retrieval when they are 8 to 9 years old, the study shows. This is the time when most students are learning basic addition and subtraction. When kids have basic math facts memorized, the brain has more free space to learn more complicated math. This process has benefits for the future. The study shows as kids grow older, their answers rely more on memory and become quicker and more accurate. Less brain activity is devoted to counting. Some children make this shift quicker than others.
[EX A]: What plays a key role in solving a math problem?

[EX Q]: Funkturm Stuttgart is a reinforced concrete transmitting tower, built in 1966 on the Raichberg of Stuttgart, Germany (Geographical coordinates: 484627''N 91323''E).
[EX A]: What material was used for Funkturm Stuttgart?

[EX Q]: With thousands of years of history and mythology in its area, prefix = st1 /Athens--named for the olive-tree-loving Athena---is more than a concrete jungle. It's a lovely city decorated by outdoor cafes, pedestrian streets, parks, gardens and plenty of characters. _ The city is connected three sides by Mt Parnitha, Mt Pendeli and Mt Hymettos. WithinAthensthere are no less than eight hills, of which the Acropolis and Lykavitos are the most famous. The hills provide a peaceful rest from the noise of the city. Just about everything of interest to the traveler is within a small area surrounding Plateia Syntagmatos (Syntagma Square). This area is connected with the districts of Plaka to the south, Monastiraki to the west, Kolonaki to the east and Omaonia to the north. Plateia Syntagmatos is dominated by the oldRoalPalaceand is the beating heart of the business district, with luxury hotels, banks and airline offices. Plaka, nestled below the Acropolis, is the old Turkish quarter and virtually all that existed when Athens was declared the capital of independentGreece. Though Plaka is packed with tourists in high season, it's also one of the prettiest and most atmospheric areas of the city. Monastiraki is the market district and a fascinating part of town to wander. Psiri, nearby, is full of stylish cafes and bars and makes a great place to stop for a rest of lunch. Kolonaki, a classy living area, is full of trendy boutiques, art galleries and cafes.
[EX A]:
If you want to buy something, where will you go?