instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which TV character has sisters called Daisy and Rose?
answer:
daisy


question:
Which 20th century British prime minister had the longest surname ?
answer:
prime minister of the united kingdom


question:
Who plays the villainous Soviet agent Irina Spalko in the 2008 film 'Indiana Jones and the Kingdom of the Crystal Skull'?
answer:

indiana jones and the kingdom of the crystal skull