TASK DEFINITION: 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.
PROBLEM: Question: Clare stopped rubbing two sticks together. The sticks became
Option1: hot
Option2: cold
Explanation: Friction causes the molecules on rubbing surfaces to move faster, so they have more heat energy.

SOLUTION: cold

PROBLEM: Question: As water cools in a kitchen it evaporates
Option1: less
Option2: more
Explanation: The higher the temperature of the liquid, the faster it will evaporate.

SOLUTION: less

PROBLEM: Question: Erin is trying to get her solution to have a pH as close to zero as possible. The best way for Erin to do that is to have the acidity of the solution
Option1: decrease
Option2: increase
Explanation: The more acidic a solution is, the closer its pH value will be to 0

SOLUTION:
increase