TASK 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.
PROBLEM: Context : Vizefeldwebel Oskar Hennrich was a German World War I flying ace credited with 20 aerial victories. 
Answer : World War I

SOLUTION: In which war did Oskar Hennrich fought?

PROBLEM: Context : Second Brother is a novel by the American writer David Guy set in 1960s Pittsburgh, Pennsylvania. 
Answer : Pittsburgh

SOLUTION: Which place is Second Brother in?

PROBLEM: Context : Philip Affleck (1726--1799) was an admiral in the Royal Navy. 
Answer : Royal Navy

SOLUTION:
What armed force did Philip Affleck serve in?