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:
Released in 1978, what was the title of Kate Bush's second album Braveheart, Lionheart or Sweetheart?
answer:
lionheart

question:
Although courted by his political opponent, Stephen Douglas, Mary Todd chose to marry which future American president?
answer:
abraham lincoln

question:
On which river do the cities of Dresden and Hamburg stand?
answer:
elbe