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.
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Question: Which actor plays the title role in the Harry Potter films?

Answer: daniel radcliffe


Question: Kirk Douglas played the title role in which 1960 film about Roman slaves?

Answer: spartacus


Question: What is the English title of the carol written in 1818 by Austrian priest Josef Mohr originally called Stille Nacht?

Answer:
silent night