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.

[EX Q]: Question: If Milo wants to make his water saltier and begins removing 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.
[EX A]: decreases

[EX Q]: Question: Kevin has a hybrid car and Steve has a large truck. Which car likely pollutes less? 
 Option1: hybrid 
 Option2: truck 
 Explanation: Plug-in hybrids run for a longer time on electricity and so are less polluting than regular hybrids.
[EX A]: hybrid

[EX Q]: Question: We are designing a submarine to study fish that live far below the surface of the ocean. Before we can send a human researcher down in the submarine, we have to be sure it can tolerate the pressure of the water without cracking. The tougher test will be to send our submarine down to 
 Option1: 500 feet or 
 Option2: 1500 feet? 
 Explanation: A fluid exerts pressure in all directions, but the pressure is greater at greater depth.
[EX A]:
1500 feet?