Definition: 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 French Academy of Sciences had commissioned an expedition led by Jean Baptiste Joseph Delambre and Pierre Mechain Link Information: Jean Baptiste Joseph, chevalier Delambre (19 September 1749 19 August 1822) Question: Which astronomer who went on an expedition for the French Academy of Sciences was the oldest?
Output:
Answer: Pierre Mechain