If dish 5 is the only dish stored on the bottom shelf and if exactly two ... ...

If dish 5 is the only dish stored on the bottom shelf and if exactly two of the dishes are stored on the middle shelf, then which one of the following is a pair of dishes that must be among the dishes stored on the top shelf?
(A) dish 1 and dish 2
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in June 2013 LSAT (PT69): Analytical Reasoning