In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Example input: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Example output: Who believes Fagin's gang make wallets and handkerchiefs?.
Example explanation: This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.
Q: Passage: Upon receiving a key from her Uncle Max, Cabella travels to Italy where she discovers the key is related to a house named Cabella near a village. While traveling she stops near a waterfall to swim and loses the key, but a mysterious man returns the key. She then travels to the village, finds the house, and uses the key to open it.
The next day she goes to the market where the mysterious man works and learns from his cousin Maria that his name is Leo and he is deaf and mute. Maria and Cabella become friends and Maria introduces her sisters Sophia and Giulia. Later that evening Maria tells Cabella that she has a crush on Lord Jai, a rich man from India that attended a boarding school. That night, Cabella has a conversation with a spirit named Angelo and has strange dreams about her mother. 
The next morning, Cabella finds a basket with goods such as eggs and apples sent by Leo. Maria then takes Cabella to her sister Ambrosia's funeral because she died from a heart attack. That night Angelo visits her and confesses that she must go to the cemetery to learn more information. At the cemetery, she meets Senior Bronzini, who, according to rumors, had a relationship with a nun when he was younger. Cabella decides to leave flowers for Chiara, a woman buried next to Ambrosia who has no flowers.
A:
What is the name of the man who returns the key to Cabella?