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 TV series, which debuted in 1951, featured the weekly travails of, Just the facts, ma'am, Sgt Joe Friday?
answer:
dragnet


question:
Which actor played Al Jolson in The Jolson Story and it sequel?
answer:
larry parks


question:
Who played the title character in the 2010 film Harry Brown?
answer:

michael caine