Question is

What is (just) one example of a physical object other than Federal Reserve notes, gold or silver certificates that could be chosen by a group of people to use as money (a medium of exchange) in the United States today?

I think land can be the answer, could you tell me land can be the answer or not? And, please tell me why land can be the answer.

Please demonstrate your understanding of how why land could have the function of money known as a "Unit of Account" (with two different numerical prices), as it is described ?"