instruction:
In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.
question:
Who played gideon on once upon a time?
answer:
Giles Matthey


question:
When does crossing over occur in prophase 1?
answer:
pachytene stage


question:
Where is the smallest bone in the human body found?
answer:

middle ear