Definition: Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Input: Context : Mario de Bernardi (1893--1959) was an Italian World War I fighter pilot, seaplane air racer of the 1920s, and test pilot of early Italian experimental jets.
Answer : World War I
Output:
During which historic war was Mario de Bernardi an officer?