Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: This is a "puffball" fungus. At maturity, clouds of a brown dust-like power escape when they are touched. This powdery substance is made up of spores, the reproductive structure of the fungus. Answer: spores
Output:
What is the cloud of brown dust-like power that escapes when a puffball fungus is touched?