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.

[EX Q]: 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.
[EX A]: speed up

[EX Q]: Question: A rubber band, when it is relaxed, will _____ elastic force. 
 Option1: gain 
 Option2: lose 
 Explanation: The farther the material is stretched or compressed, the greater the elastic force becomes.
[EX A]: lose

[EX Q]: Question: If a stream begins moving slower, what will happen to the size of the particles it carries? 
 Option1: get bigger 
 Option2: get smaller 
 Explanation: In erosion, a slower moving stream will only carry smaller particles.
[EX A]:
get smaller