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: He saw action during the Austro-Prussian War in 1866 Link Information: Von Bülow served through the Franco-Prussian War of 1870 Question: Which of the wars that Karl von Bulow served in lasted the longest?
Output:
Answer: Franco-Prussian War