A. B, and C sell their products. One of these three products is a counterfeit product, and the other two are genuine products. A said, "My product is a genuine product, and B's product is a counterfeit product. " B said: "My product is genuine, C's product is a counterfeit product"; C said: "B's product is a genuine product, and A's product is a counterfeit product. " It is known that one of the three persons A. B, and C has two sentences. It is true that one sentence is true, one sentence is false, and one sentence is false. Well, the counterfeit products are (). ['A.', 'B.', 'C.', 'Unsure.']