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: Fred has an isotope that decays quickly. What is likely true about it? 
 Option1: it can be used to date older specimens 
 Option2: it can't be used to date old specimens 
 Explanation: Because these isotopes decay more slowly, they can be used to date much older specimens.
answer:
it can't be used to date old specimens


question:
Question: Noah has noticed that the galaxies are contracting. This will make the galaxies 
 Option1: nearer 
 Option2: further apart. 
 Explanation: As the Universe expands, galaxies move further and further apart.
answer:
nearer


question:
Question: Carl has testing done to see if he has cancer, and it is caught in the very late stages. The difficulty in treating the cancer will therefore be 
 Option1: easier 
 Option2: harder 
 Explanation: The sooner cancer is detected the easier it is to treat.
answer:

harder