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: If Mona moves her baseballs closer together, what happens to the gravitational pull between them? 
 Option1: increases 
 Option2: decreases 
 Explanation: The closer objects are, the stronger the gravitational pull between them.
answer:
increases


question:
Question: The air gets thicker when it is 
 Option1: hot 
 Option2: cold 
 Explanation: Increasing air temperature decreases atmospheric pressure.
answer:
cold


question:
Question: When we raise the temperature of water it becomes 
 Option1: less dense 
 Option2: more dense 
 Explanation: When a volume of water is cooled, the molecules move less vigorously, so same number of molecules takes up less space and the water is denser.
answer:

less dense