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: A rock has more mass than a pebble. Which object will exhibit a smaller force of attraction? 
 Option1: rock 
 Option2: pebble 
 Explanation: The greater the objects mass, the greater the force of attraction; in addition, the greater the distance between objects, the smaller the force of attraction.
Example Output: pebble

Example Input: Question: Dan is looking at shells that will be bad candidates for fossilization. He chooses the shells that are 
 Option1: softer 
 Option2: harder 
 Explanation: Hard shells fossilize more readily than soft bodied organisms, as they are better at resisting decay, take significantly longer to break down, and have a greater chance of surviving burial under layers of sediment.
Example Output: softer

Example Input: Question: Jeff should add _____ to his engine to decrease the friction in its processes. 
 Option1: oil 
 Option2: gas 
 Explanation: To reduce friction, oil is added to the engine.
Example Output:
gas