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: Mel stops after running down the street for exercise. As Mel's heart rate decreases, Mel's blood flow 
 Option1: decreases 
 Option2: increases 
 Explanation: Warming up exercises increases the blood flow to the muscles and increases the heart rate.
answer:
decreases


question:
Question: By pouring a pound of salt into a bucket of fresh water, could you cause the density of the water to 
 Option1: increase 
 Option2: decrease? 
 Explanation: Water density increases as salinity and pressure increase, or as temperature decreases.
answer:
increase


question:
Question: When two things are small they have what level of gravitational force? 
 Option1: High 
 Option2: Low 
 Explanation: The greater the objects mass, the greater the force of gravitational attraction.
answer:

Low