In this task, you are given a fact statement and question based on the fact. Your task is to generate the correct answer for the question. The answer needs to be generated using the context fact statement.

Fact: classifying means grouping materials by their properties. Question: Which would be excluded from a list of objects with metallurgical properties?
bone

Fact: An example of reproduction is laying eggs. Question: A way to reproduce is to?
produce ovum

Fact: cloudy means the presence of clouds in the sky. Question: Over your head is dark though it is only afternoon on a summer's day. Lacking an eclipse of the sun, a viable reason for this darkness is?
its about to storm