Definition: In this task, you're given a statement and three sentences as choices. Your job is to determine the neutral choice based on your inference from the statement and your commonsense knowledge. The neutral choice is a sentence that neither agrees nor disagrees with the statement. Indicate your answer as '1', '2', or '3', corresponding to the choice number of the selected sentence. If sentence X agrees with sentence Y, one's correctness follows from the other one. If sentence X disagrees with sentence Y, they can not be correct at the same time.
Input: Statement: As far as we know, the U.S. is the only country that has a mail box rule. Choices: 1. The U.S. is the only country with a rule about mailboxes. 2. No countries have a law about mailboxes. 3. The U.S. has a mailbox law.

3