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 Input:
Question: Yolanda moved to Denver where it is 5000 feet above sea level. The atmosphere here is considered
Option1: dense
Option2: thin
Explanation: The density of the atmosphere decreases with an increase in the height above sea level (altitude).

Ex Output:
thin

Ex Input:
Question: If Mona shines a light through both wool and cotton and determines that cotton is more dense then wool, which material will the light move faster through?
Option1: wool
Option2: cotton
Explanation: The more dense the medium, the slower the light moves.

Ex Output:
wool

Ex Input:
Question: Long ago the surface of Venus warmed enough that greenhouse gases escaped into the atmosphere. As a result, the greenhouse effect on that planet
Option1: increased
Option2: decreased
Explanation: An increase in greenhouse gases leads to greater greenhouse effect.

Ex Output:
increased