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'.
Q: Context: Three years later he went to Ascension Island to observe a near approach of Mars and to calculate its distance. Link Information: It is governed as part of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha Question: What country claims ownership of the place Gill calculated the distance of Mars' approach?
A:
Answer: British