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: Compared to the blue super giant star Rigel, would the Sun, which is a yellow dwarf star, be 
 Option1: hotter? 
 Option2: cooler 
 Explanation: But, in stars, the bluer the star, the hotter it is, and the redder it is, the older and colder it is.
[EX A]: cooler

[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: Ron is trying to figure out how old some isotopes are. The isotopes are decaying very quickly, so they are likely specimens that are 
 Option1: older 
 Option2: younger 
 Explanation: Because these isotopes decay more slowly, they can be used to date much older specimens.
[EX A]:
younger