There are three boxes: one contains only apples, one contains only oranges, and one contains both apples and oranges. Each box is labeled incorrectly. If you can only pick one fruit from one box, how can you correctly label all the boxes?
A, B, C, D, and E are seated in a row. A is not at either end. C is sitting to the right of A. D is sitting to the left of E. Who is sitting at the extreme right?