Generate a correct and concise answer for the question based on the words in the context.

Example input: 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 output: Havana
Example explanation: According to context Issac Nicola's city of birth is Havana. Hence this is a correct output.
Q: Context : The Desert Patrol Vehicle (DPV), formerly called the Fast Attack Vehicle (FAV), is a high-speed, lightly armored sandrail-like vehicle first used in combat during the Gulf War in 1991.
Question : Which was the official year for the approval of Desert Patrol Vehicle?
A:
1991