Instructions: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Input: Context: The sight of the infant caused them both to go insane and they threw themselves off the Acropolis Link Information: it was Pericles (c. 495429 BC) in the fifth century BC who coordinated the construction of the site's most important present remains including the Parthenon, the Propylaia, the Erechtheion and the Temple of Athena Nike. Question: When was the building off of which the sisters flung themselves first constructed?
Output:
Answer: fifth century BC