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: When we are building a computer if we want to add resistance we need 
 Option1: more resistors 
 Option2: fewer resistors 
 Explanation: Increasing the number of resistors in a series circuit increases the overall resistance of the circuit.
answer:
more resistors


question:
Question: Sandra was suddenly scared and her adrenal glands secreted adrenaline to prepare her fight or flight response, which caused her heart rate to 
 Option1: decrease? 
 Option2: increase 
 Explanation: This causes the delivery of less oxygen to the cells, and this stimulates the heart rate via adrenalin, so that pulse rate increases in an effort to deliver enough oxygen to cells.
answer:

increase