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.

Example Input: Question: Chris is studying two countries. He finds that China has half as many factories putting out fossil fuels into the air than the United States. Based on this information, the factories in _____ are causing more air pollution. 
 Option1: United States 
 Option2: China 
 Explanation: Because richer nations use more fossil fuels, they also cause more air pollution and global warming than poorer nations do.
Example Output: United States

Example Input: Question: Will waves on the ocean be larger or smaller if they are caused by wind compared to rocks? 
 Option1: larger 
 Option2: smaller 
 Explanation: A wave caused by a disturbance with more energy has greater amplitude.
Example Output: smaller

Example Input: Question: Sarah is looking at layers of rock on a cliff face. She can see that the rock at the very bottom of the cliff are 
 Option1: older 
 Option2: younger 
 Explanation: The upper rock layers are much younger.
Example Output:
older