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.

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.
horse

Question: Katie wants to get light to turn to rainbow colors by using a lens to filter the light through. In order to get the most colors, Katie will use a lens that is 
 Option1: flat 
 Option2: curved 
 Explanation: The more curved the surface of a lens is, the more it refracts the light that passes through it.
curved

Question: Tom was digging in his backyard one day, after two inches he picked up an oval shaped rock. Tom kept digging and after twelve inches he picked up a square shaped rock, which rock was older? 
 Option1: The Oval Shaped Rock 
 Option2: The Square Shaped Rock 
 Explanation: The upper rock layers are much younger.

The Square Shaped Rock