instruction:
We would like you to assess the QUALITY of each of the following argument (discussing Gay Marriage) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of gay marriage. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gay marriage.
question:
It can't be proven that opposite-sex marriage is harmless, it can't be proven that alcohol use is harmless, it can't be proven that airbags or seatbelts are harmless, even.
answer:
Valid


question:
He claims on the religion forum that his church prayer groups have been responsible for an HIV + patient to become HIV-, and that other' cancers have disappeared through their prayers.
answer:
Invalid


question:
Jefferson did not specifically speak out against denying rights to homosexuals, but he did propose an act that would prevent the government from granting special rights based on one's religion.
answer:

Valid