Which planet is the moon thought to have come from originally?

The Moon is thought to have come from the Earth. In 1975, the giant impact hypothesis was put forward. This suggests that the Earth was hit by a planet about the size of Mars around the time of the formation of the solar system approximately 4.5 billion years ago, and the impact caused part of the outer layer of the Earth to spin off and form what is now the Moon.

answer; i believe the correct answer is (replication is not conservative);

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying