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: The air gets thicker when it is 
 Option1: hot 
 Option2: cold 
 Explanation: Increasing air temperature decreases atmospheric pressure.
Example Output: cold

Example Input: Question: Tommy traded in his four-cylinder Pinto for an eight-cylinder Mustang. The Pinto engine was 
 Option1: more powerful 
 Option2: less powerful. 
 Explanation: The more cylinders a car engine has, the more powerful its engine can be.
Example Output: less powerful.

Example Input: Question: There is a limit on how much gasoline exists, and it is being used normally. However, now gasoline will be more costly to produce, so the gasoline will be used up 
 Option1: faster 
 Option2: slower 
 Explanation: If the energy cost of obtaining energy increases, the resource will be used even faster.
Example Output:
faster