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: The blood vessels near the top of the skin do what when it's cool?
Option1: enlarge
Option2: contract
Explanation: When your brain senses that your body temperature is increasing, it sends messages to the blood vessels in the skin to increase in diameter.

SOLUTION: contract

PROBLEM: Question: As Cindy swam closer to the ocean surface, it got lighter and _____.
Option1: warmer
Option2: cooler
Explanation: Water density increases as salinity and pressure increase, or as temperature decreases.

SOLUTION: warmer

PROBLEM: Question: When people get younger what happens to their risk of cancer?
Option1: decreases
Option2: increases
Explanation: Breast cancer is rare in teens. It becomes more common as women get older.

SOLUTION:
decreases