Q: Given a paragraph about movies, and a set of conversational question answers about the paragraph, generate a relevant question to the topic of the paragraph. The paragraph has the prefix 'CONTEXT:'. Each conversation question has a prefix `Q:` followed by the answer prefix `A:`.
CONTEXT: It may be the case that the demon is cunning and wanted to make a doubt in the mind of Karras, already having a lack of faith in demons and ghosts. As we have seen that demon plays with Karras' emotions related to his mother too. The demon reads on mind and emotions so it's not possible that he got fooled by tap water at all.  <sep>  Q: Why does the demon that possesses Regan react to the “fake” holy water? A: The demon reads on mind and emotions so it's not possible that he got fooled by tap water at all  Q: So why did he do it? A: It may be the case that the demon is cunning and wanted to make a doubt in the mind of Karras, already having a lack of faith in demons and ghosts 
A:
WHo sprinkled the fake holy water?