TASK DEFINITION: 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.
PROBLEM: Question: Harry is 6 feet away from you and Sara is 15 feet away. Who will appear to move further away if they both take one step? 
 Option1: Harry 
 Option2: Sara 
 Explanation: The closer your finger is to your eyes, the greater the position changes because of parallax.

SOLUTION: Harry

PROBLEM: Question: If you fill a large canister with gas from a smaller canister will the density 
 Option1: increase 
 Option2: decrease 
 Explanation: If we take a certain amount of gas from one container and place it into another, larger container, the gas expandsto fill the larger container. The same mass of gas is now in a larger volume, the gas now has a lower density.

SOLUTION: decrease

PROBLEM: Question: Mary took a medication to lower blood pressure. What is likely happening to the blood volume in the vessels? 
 Option1: it decreases 
 Option2: it increases 
 Explanation: This is because the lower blood volume in the vessels exerts less pressure on the vessel walls.

SOLUTION:
it decreases