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.

Q: Question: What happens to the size of a population if the number of predators for that population is decreased? 
 Option1: gets bigger 
 Option2: gets smaller 
 Explanation: An increase in predators, the emergence of a new disease, or the loss of habitat are just three possible problems that will decrease a population.

A: gets bigger
****
Q: Question: Mary is taking measurements of the amount of oxygen in samples of water. If she measured the total levels of dissolved oxygen in a sample at 70 degrees fahrenheit and compared it to a sample at 80 degrees fahrenheit, which would contain more dissolved oxygen? 
 Option1: 80 degrees fahrenheit 
 Option2: 70 degrees fahrenheit 
 Explanation: Warm water cant hold as much dissolved oxygen as cool water, so an increase in the temperature of water decreases the amount of oxygen it contains.

A: 70 degrees fahrenheit
****
Q: Question: Dr. Roberts noticed a decrease in the death rate. A(n) _____ chance of deadly disease likely contributed to this factor. 
 Option1: increased 
 Option2: decreased 
 Explanation: With better food and less chance of disease, the death rate fell.

A:
decreased
****