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: When the villagers are living longer, the food source is likely 
 Option1: great 
 Option2: small 
 Explanation: More recently, the death rate has fallen because of the availability of more food and medical advances.
[EX A]: great

[EX Q]: Question: Dane is checking the pH of his project and sees that it is quite high, which means that the acid in his project is 
 Option1: higher 
 Option2: lower 
 Explanation: Lower pH numbers are more acidic and higher numbers are less acidic (also called more alkaline).
[EX A]: lower

[EX Q]: Question: If Milo is out exploring and he comes across two glaciers, each with their own u-shaped valley, will the smaller or larger glacier have a larger u-shaped valley? 
 Option1: larger glacier 
 Option2: smaller glacier 
 Explanation: Smaller tributary glaciers, like tributary streams, flow into the main glacier in their own shallower U-shaped valleys.
[EX A]:
larger glacier