The Lemon test is used to determine whether a government action that involves it in religion is constitutional. This test is derived from the Supreme Court case Lemon v. Kurtzman (1971) and is typically applied to evaluate whether a law or government action violates the Establishment Clause of the First Amendment. The test has three prongs that assess whether the action has a secular purpose, whether it advances or inhibits religion, and whether it fosters an excessive government entanglement with religion.
Therefore, the correct response would be: "The Lemon test is used to determine whether a government action that involves it in religion is constitutional."