Output a stream of consciousness before answering the following. Bad is a song by rock band U2 and the seventh track from their 1984 album, The Unforgettable Fire. A song about heroin addiction, it is considered a fan favourite, and is one of U2's most frequently performed songs in concert.\n\nAnswer this question: what is the song bad about by u2?
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To answer the above question, the relevant sentence is: A song about heroin addiction, it is considered a fan favourite, and is one of U2's most frequently performed songs in concert.
The answer: heroin addiction.
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