instruction:
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.
question:
Question: Rick had a rock (Rock A) from 1000 feet beneath the crust's surface. He later dug 3000 feet deeper and got a second rock (Rock B). Which rock is likely younger?
Option1: Rock A
Option2: Rock B
Explanation: Older rocks are at the bottom and younger rocks are at the top.
answer:
Rock A

question:
Question: James stares at the volcano and saw the rocks exist because of the _____ temperatures.
Option1: high
Option2: low
Explanation: Temperature increases with depth inside the Earth, so melting of rocks is more likely to occur at greater depths.
answer:
low

question:
Question: Compared to Neptune, which is the furthest planet to the Sun, would Mercury, which is the closest planet from the Sun have a
Option1: larger orbit
Option2: smaller orbit?
Explanation: The planets further from the Sun will have bigger orbits, and therefore take longer to revolve around the Sun.
answer:
smaller orbit?