Problem: Given the question: the students used yeasts in two different experiments: they baked bread using baker's yeast, and made beer, using brewer's yeast. They learned a lot about sugars and chemistry. Which yeast is worse for bakery products?
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The answer is:
brewer's yeast

Problem: Given the question: Planet Earth and planet Mars both had breathable atmospheres and were inhabited by humans. People of Earth destroyed the ozone layer, people of mars were more careful and protected it. Which planet had fewer people using aerosol sprays?
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The answer is:
Mars

Problem: Given the question: On March 2015 Japans economy soared. There was a likelihood that the Japanese yen would rise in value. In the wake of this event, Japanese Government adjusted the price of Japanese Currency Yen in accordance with the going market price. On the other hand, at he same time, UK was having economic downturn. There was a likelihood that the UK Currency Pound Sterling would go down. Fearing public backlash, UK Government kept the price of the Pound Sterling at the same level. Will Japanese Yen be exchanged or not be exchanged in the black market?
++++++++++++++++++++++++++++++++
The answer is:
not be exchanged