instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which 1981 film , directed by John Huston, starred footballers Bobby Moore, Pele and Osvaldo Ardiles?
answer:
osvaldo ardiles


question:
What is the smallest country in Central America Costa Rica, Venezuela or El Salvador?
answer:
central america


question:
'Officer Alex J.Murphy' became better known by what name in the title of a 1987 film?
answer:

alex murphy