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.
One example: 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 is here: Who believes Fagin's gang make wallets and handkerchiefs?.
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.

Now, solve this: Passage: Drama critic John Earl observes a piece of artwork in a museum, gazing at it reverently. He asks the museum curator how much it costs, and the curator says that it is not for sale. The artist, James Harlan Corbin [Lederer], does not wish to sell the painting. Nonplussed, Earl returns to his office and phones Corbin with his proposal to sell. Again, Corbin refuses. Earl continues his pursuit to find out who the model for the painting was. He learns it is Helen North, a young woman who looks nothing like the woman in the painting. He visits with her to learn his location, but she refuses, telling him that she will be singing at a local nightclub, where Corbin frequents. Earl finds both of them in the museum, and again confronts Corbin. Becoming clearly annoyed, Corbin invites the singer out for a night in his yacht. She agrees, but is later found washed ashore. Although Police Lt. Roberts initially questions Helen's suitor Hunt Mason, Mason implicates Corbin as the last person who saw Helen North. John Earl works with the police department to arrange for Helen's sister Linda to apply for modeling, in order to spy on Corbin. The two return to Corbin's boathouse. While there, Linda calls for Earl and tells his chef that she is in danger and to notify the police. There, she learns that Corbin did not murder her sister. Thereafter, she falls in love with Corbin and agrees to support him against the district attorney's allegations he killed both Helen and another model, Madonna. Although Corbin has visions that he did so, Linda tells him to make sure he is telling the truth before confessing such heinous crimes. Linda returns home with Corbin's mother, who poisons her tea and tries to inject her with a lethal substance before police shoot. Corbin had suddenly recognized who it was that had planted evidence at the boathouse to implicate him. Police arrive just in time to save Linda from death but not Mrs. Corbin, who dies in her son's arms.
Solution:
What is the full name of the person who has a sister named Linda?