TASK DEFINITION: In this task, you will be presented with a question and you have to answer the question based on your knowledge. Your answers should be as short as possible.
PROBLEM: Which is the oldest castle that is only listed as a museum ?

SOLUTION: Torpa Castle

PROBLEM: What is the tradition of the instrument that commonly has four courses of doubled metal strings tuned in unison ?

SOLUTION: Europe , has spread worldwide

PROBLEM: What does the abbreviation for the system used by the U.K. 's fifth national terrestrial analogue channel stand for ?

SOLUTION:
Phase Alternating Line