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'.

[EX Q]: Context: where it turns eastward and northeastward, flowing across the northern Great Plains past the city of Billings Link Information: none Question: Who is the current mayor of the city located on the northern Great Plains that the Yellowstone River flow through?
[EX A]: Answer: none

[EX Q]: Context: EBV appears to cause all nonkeratinizing nasopharyngeal carcinomas and some cases of lymphoma, including Burkitt's lymphomathe association is especially strong in Africaand Hodgkin's disease. Link Information: none Question: How fatal is Burkitt's lymphoma?
[EX A]: Answer: none

[EX Q]: Context: lthough originally proposed to the French space agency CNES, it was considered too complex and expensive for a single national programme. Its acceptance within the European Space Agency's Link Information: when ESRO was merged with ELDO. ESA had ten founding member states: Belgium, Denmark, France, West Germany, Italy, the Netherlands, Spain, Sweden, Switzerland, and the United Kingdom. Question: What countries make up the agency that Hipparcos was accepted to after being considered too complex for CNES?
[EX A]:
Answer: Belgium