This question comes from an old practice exam that I received permission to reuse. It is based on the fact that LR13 tonifies the Spleen, which will in turn help Dampness. The same can be said for GB25 which is indicated for helping Drain excess fluids.
We are pretty huge sticklers for *everything* being in Deadman and the CAM, but sometimes there are really good questions that have been used on past exams so we make sure to include them in your bootcamp. I hope you understand this reasoning.