Problem: Stefani Germanotta is better known in the pop music world as whom?
Answer: lady gaga

Problem: Which species of animal at an East German zoo had a hip replacement operation in January 2011?
Answer: tiger

Problem: Which New Zealand-born scientist is credited with being the first to 'split the atom'?
Answer: ernest rutherford

Problem: What can be a fictional president, a fruit cultivar, and a book of quotations?
Answer:
bartlett