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: Martial law in Thailand derives statutory authority from the Act promulgated by King Vajiravudh Link Information: Martial law in Thailand derives statutory authority from the Act promulgated by King Vajiravudh  Question: Where was the person born who promulgated the act that gives statutory authority to martial law in Thailand?
[A]: Answer: Siam


[Q]: Context: Roycroft was born in 1946 as the second of three sons to Bill Roycroft, an Olympic equestrian gold medallist Link Information: After the war, they moved with their son Barry (born 1944) to a 200 ha soldier's block near Camperdown in western Victoria, where they set up a dairy farm. The couple had two further sons, Wayne (born 1946) and Clarke (born 1950).  Question: What are the names of the equestrian gold medallist's other sons?
[A]: Answer: Barry


[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?
[A]:
Answer: none