You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.

Question: Katie is rubbing her hands on her leg. One hand rubs fast, the other hand rubs slow. The hand that will be cooler in the end is the one that moves 
 Option1: faster 
 Option2: slower 
 Explanation: Friction causes the molecules on rubbing surfaces to move faster, so they have more energy. This gives them a higher temperature, and they feel warmer.
slower

Question: If a person sank lower within the mesosphere, would the temperature 
 Option1: increase 
 Option2: decrease 
 Explanation: In the mesosphere, temperature decreases as altitude increases.
increase

Question: Compared to an obese person who has never exercised, would an Olympic sprinter in perfect condition be more likely to have a heart that can, with each beat, move 
 Option1: more blood 
 Option2: less blood? 
 Explanation: When a person exercises regularly, and is fit, the heart undergoes certain long-term adaptations. The heart muscle gets stronger, and expels more blood with each contraction.

more blood