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'.

Context: The foreword of the book was written by Grafton Elliot Smith. Link Information: none Question: How long did Grafton Elliot Smith know Donald Alexander Mackenzie at the time he wrote the foreword of Ancient Man in Britain?
Answer: none

Context: La Hire joined Charles VII in 1418, when the English army invaded France. Link Information: Charles VII (22 February 1403 – 22 July 1461) Question: How old was Charles VII when La Hire joined him?
Answer: 15

Context: After the end of the war, there was little Korean migration or tourism in Vietnam, until the rise of the South Korean economy Link Information: none Question: When did the South Korean economy rise up?

Answer: none