Problem: What classic short story by the French writer Guy de Maupassant concerns an invisible malevolent spirit that aims to take control over the narrator?
Answer: horla

Problem: Which 2007 Rihanna song topped the charts in fifteen countries?
Answer: umbrella

Problem: What single vowel letter symbol generally refers in science to 'any element'?
Answer: e

Problem: "Which author wrote the classic Russian novel, ""The Brothers Karamazov""?"
Answer:
fyodor dostoevsky