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 Nelson Monument on Glasgow Green was designed by David Hamilton and paid for by public subscription. Link Information: none Question: How many years had David Hamilton been a professional when he designed The Nelson Monument on Glasgow Green?
Output:
Answer: none