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.
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Question: Question: If Milo calms down and his heart starts pumping less blood with each stroke, what happens to his heart rate? 
 Option1: increases 
 Option2: decreases 
 Explanation: When the heart expels more blood with each stroke, the heart has to beat less often in order to maintain the same volume of blood flow.

Answer: increases


Question: Question: If Milo wants to make his water saltier and begins adding salt to the glass, what happens to the density of the glass of water? 
 Option1: decreases 
 Option2: increases 
 Explanation: If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser.

Answer: increases


Question: Question: Sean is trying to see how fast the water molecules are moving in a container of water. He observes that the molecules are moving very slowly, so the temperature must be 
 Option1: cool 
 Option2: warm 
 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:
cool