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: Rich was examining a cliff face. Which part of the cliff is younger, geologically speaking? 
 Option1: the base 
 Option2: the top 
 Explanation: The upper rock layers are much younger.
[EX A]: the top

[EX Q]: Question: If water is close to a source of nutrients it will have 
 Option1: few nutrients 
 Option2: more nutrients 
 Explanation: Water near shore generally has more dissolved nutrients than water farther from shore.
[EX A]: more nutrients

[EX Q]: Question: If air warms, it becomes _____ dense. 
 Option1: less 
 Option2: more 
 Explanation: Warm air is less dense than cool air, so it rises higher in the troposphere.
[EX A]:
less