TASK DEFINITION: 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.
PROBLEM: Question: As waves get smaller the frequency of them 
 Option1: increases 
 Option2: decreases 
 Explanation: Wave frequency can be measured by counting the number of crests or compressions that pass the point in 1 second or other time period. The higher the number is, the greater is the frequency of the wave.

SOLUTION: increases

PROBLEM: Question: In ancient times, there was worse medicine. This means there was a _____ death rate. 
 Option1: lower 
 Option2: higher 
 Explanation: More recently, the death rate has fallen because of the availability of more food and medical advances.

SOLUTION: higher

PROBLEM: Question: A big cow, compared to a calf, will have more atoms and therefore, the thermal energy of the larger cow is 
 Option1: lesser 
 Option2: greater 
 Explanation: An object with more mass has greater thermal energy than an object with less mass because it has more atoms.

SOLUTION:
greater