input question: Two brothers, Tom, aged 26, and Paul, aged 16 were into sports. Tom started weight-lifting to gain more muscle mass. Three years later he was 20-25 lbs. heavier. Paul started track and field, he liked running. Which brother had thicker bones after three years????
output answer: Tom

input question: Berg city used only gas powered vehicles while Hill city used electrical vehicles. The two cities had a similar population and vehicle numbers. Which city had fewer problems with nitrogen oxides????
output answer: Hill

input question: When comparing village A from ten thousand years ago to village B from today, we reached the conclusion that today's villagers release much more carbon into the atmosphere by their activities. Which village burned more fossil fuels????
output answer: village B

input question: Barbara and Jane are two students. They both like meteorology. Barbara studies the formation of the ozone layer, while Jane studies about the stratosphere. Which student learned more about radicals combining with molecular oxygen to form ozone????
output answer:
Barbara