instruction:
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:
Question: When it is very warm what happens to the speed of items? 
 Option1: speed up 
 Option2: slow down 
 Explanation: For a given medium, sound waves travel more slowly at lower temperatures.
answer:
speed up


question:
Question: Lana is watching two waterfalls. The first waterfall is very steep, and the other is just a slope. The waterfall which will have the least erosion at the bottom is the one with the water which falls 
 Option1: slower 
 Option2: faster 
 Explanation: Water flowing over a steeper slope moves faster and causes more erosion.
answer:
slower


question:
Question: Dana wants the gas to move freely, with as much energy as possible so the particles can move quickly. Dana will then do this to the gas 
 Option1: cool 
 Option2: heat 
 Explanation: If the gas is heated, the particles will move faster as they gain more energy.
answer:

heat