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.

[EX Q]: Question: When we look at animals when their population gets bigger what happens to each animal? 
 Option1: grow bigger 
 Option2: shrink 
 Explanation: In exponential growth as the population size increases, the growth rate also increases.
[EX A]: grow bigger

[EX Q]: Question: John was weighing some materials in his science lab. He observed that as objects had greater density, the heaviness of the objects 
 Option1: Increased 
 Option2: Decreased 
 Explanation: A given volume of a denser substance is heavier than the same volume of a less dense substance.
[EX A]: Increased

[EX Q]: Question: One side effect of driving cars is the production of greenhouse gases. If fewer cars are put on the roads, what would happen to the greenhouse effect on the Earth's atmosphere? 
 Option1: it would become greater 
 Option2: it would become smaller 
 Explanation: An increase in greenhouse gases leads to greater greenhouse effect.
[EX A]:
it would become smaller