Generate a correct and concise answer for the question based on the words in the context.
Example: Context : Isaac Nicola Romero (1916 in Havana, Cuba -- 1997) was a prominent Cuban guitarist and one of the founders of the modern Cuban Guitar School.
Question : What was Isaac Nicola's city of birth?
Example solution: Havana
Example explanation: According to context Issac Nicola's city of birth is Havana. Hence this is a correct output.

Problem: Context : ''Karl-Gerat'' (040/041) (German literally ''Karl-device''), also known as Morser Karl, was a World War II German self-propelled siege mortar (Morser) designed and built by Rheinmetall.
Question : What is the war during which Karl-Gerat was in the armed forces?
Solution: World War II