Problem: Two groups of people were part of a science study. Group A ate lots of fats(lipids), while Group B had a more balanced diet with few fats. Group A gained a lot of weight over the course of the 6 month study. Which group had normal lipid levels in the blood?

A: Group B

Problem: Jake and his son Ryan just had their yearly physical examination by the doctor. As part of this year's examination, both men had their arterial walls examined to identify the presence of plaques. The doctor discovered that Jake had a high amount of plaques present on the interior of his arterial wall. Ryan, on the other hand, had no plaques present. Who does not have atherosclerosis?

A: Ryan

Problem: 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 air pollution?

A: London

Problem: Hawk and Brunt were two colleagues studying about plants. Later on, Hawk got specialized in normal plants, while Brunt decided to learn more about epiphytes. Which colleague studied more about orchids?

A:
Brunt