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: Mona is a scientist studying erosion at a university. She is observing a river. If she starts taking erosion measurements at the mouth of the river and moves up to the head of the river, what will she find happens as the slope gets steeper? 
 Option1: erosion decreases 
 Option2: erosion increases 
 Explanation: Water flowing over a steeper slope moves faster and causes more erosion.
Example Output: erosion increases

Example Input: Question: Dan needs to stay warm in the woods, and can bring one animal for body heat to sleep next to him. Given the choice between a horse and cat, Dan will choose the 
 Option1: cat 
 Option2: horse 
 Explanation: Therefore, an object with more mass has greater thermal energy than an object with less mass, even if their individual atoms are moving at the same speed.
Example Output: horse

Example Input: Question: Chris is going car shopping. He has two choices, a car with 6 cylinders or a car with 4 cylinders. If Chris wants to get the car with the less powerful engine, then he should go with the car with 
 Option1: 6 cylinders 
 Option2: 4 cylinders 
 Explanation: The more cylinders a car engine has, the more powerful its engine can be.
Example Output:
4 cylinders