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: Due to levels of friction which of these would be easier to push across the ground? 
 Option1: A 10 pound brick 
 Option2: A 1000 pound block 
 Explanation: The faster or larger a moving object is, the greater is the fluid friction resisting its motion.
answer:
A 10 pound brick


question:
Question: A place with a _____ water table means wells can be dug at deeper depths. 
 Option1: high 
 Option2: low 
 Explanation: As the water is pumped out, the water table slowly falls, requiring wells to be dug deeper, which takes more money and energy.
answer:

low