Problem: Given the question: Two sister cities used different methods to produce electricity. London used fossil fuels, while Edmonton use entirely hydro power to generate energy. Which city causes more global warming?
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The answer is:
London

Problem: Given the question: An accident occurred in a local chemical factory. Consequently, large amount of various gases been released to the atmosphere. Local hospital is evaluating all the patients who have been affected by this accident. John, a doctor at the hospital, is seeing two patients, patient A and patient B. He concluded that patient A was having Fink effect. But he didn't see any sign of Fink effect in patient B. Which patient's alveolus would have high concentrations of oxygen and carbon dioxide, patient A or patient B?
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The answer is:
patient A

Problem: Given the question: Benjamin is taking an Army training class and is learning to operate a tank. Today, he is in a tank with an instructor on a training course. Benjamin drives the tank forward and comes to a large dirt mound blocking his path. He needs to decide whether to break the left tread or right tread. If Benjamin wanted to turn left which tread side should he break?
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The answer is:
left tread