What question did Clarisse ask Montag that disturbed him?

This question needs to be more specific. Throughout the book until (*SPOILER*) Clarisse dies, she asks Montag many thought provoking questions. In the first scene with her, she asks him if he is happy, which causes him to reconsider his relationship with Mildred. When they next meet, Clarisse asks him if he thinks people who race down the roads see the grass as a green blob, or flowers as pink blobs etc., which makes Montag think more generally about the world around him. Finally, these last few quips aren't exactly questions, but they are sufficient. Clarisse shows Montag the world. She is the first person to get to him, really exposing him to all of the simple, marvelous yet neglected opportunities there are. She tastes rain, which he does later in an attempt of exploration. She rubs a dandelion on his chin, which he has never heard of before or done. So, there isn't a clear-cut right answer to this question, but is does give rise to a host of different, equally good ones.