Q: Passage: The story depicts the effect of understimulation on the narrator's mental health and her descent into psychosis. With nothing to stimulate her, she becomes obsessed by the pattern and color of the wallpaper. "It is the strangest yellow, that wall-paper! It makes me think of all the yellow things I ever saw -- not beautiful ones like buttercups, but old foul, bad yellow things. But there is something else about that paper -- the smell! ... The only thing I can think of that it is like is the color of the paper! A yellow smell."

Question: Based on this passage, what does the wallpaper smell like in the yellow wallpaper? Let's give stream of consciousness first:
The important part for answering this question is: A yellow smell." Therefore, the final answer is A yellow smell.