You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

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.
Solution: Who believes Fagin's gang make wallets and handkerchiefs?.
Why? 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.

New input: Passage: Old Mother Riley is sacked from her job as a step cleaner at the office where her daughter Kitty works. She goes home to make steak and kidney pudding for their lodger, Joe, who is vaguely engaged to Kitty, but distractedly pours castor oil into the gravy, with amusing results. Jo is not sure he wants to be tied down to Kitty (or her impossible mother) and arranges for his travel agency employers to post him to Paris for six months, much to Kitty's discomfiture. While changing a light bulb, Old Mother Riley has a fall from a stepladder, resulting in her hospitalisation: keen to claim the maximum amount on her insurance she alters her medical records for the worse, only to be carried off for an emergency operation when the doctors see how much appears to be "wrong" with her. However, the ruse works: just as bailiffs are arriving to remove all Old Mother Riley's furniture, her insurance agent arrives with £250 in cash, which she uses to pay off her rental arrears and treat Kitty and herself to an air flight to Paris, in order to check up on Joe, who has meanwhile become involved with a suspicious young Parisian lady (really a spy with code name "Madame Zero", who believes he is an English agent).
Solution:
Who buys the plane tickets for Paris so they can check up on Jo?