instruction:
Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
question:
What is the chief port of Iraq?
answer:
basra


question:
In which country is the port of Fray Bentos?
answer:
uruguay


question:
 'Fidelio' is the only opera written by which composer?
answer:

beethoven