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: When in the stratosphere, Dean can tell that the temperature is getting cooler as the altitude he is at
Option1: increases
Option2: decreases
Explanation: The stratosphere contains the ozone layer, the temperatures increase as altitude increases.

SOLUTION: decreases

PROBLEM: 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.

SOLUTION: great

PROBLEM: Question: Paul measured a resistor's temperature at 20C. Another resistor he measured at 30C. If both resistors are the same type, which offers less resistance?
Option1: 20C
Option2: 30C
Explanation: The hotter a resistor becomes the more resistance it has.

SOLUTION:
20C