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: In a technologically-advanced 1939, the zeppelin Hindenburg III moors itself atop the Empire State Building. Aboard the airship is Dr. Jorge Vargas, a scientist who arranges for a package containing two vials to be delivered to Dr. Walter Jennings. The courier looks back while leaving with the vials, to see that Dr. Vargas has vanished.
Polly Perkins, a reporter for The Chronicle, is looking into the disappearances of Vargas and five other renowned scientists. A cryptic message leads her to Radio City Music Hall, against the warnings of her editor, Mr. Paley, where she meets Dr. Jennings during a showing of The Wizard of Oz. He tells her that a Dr. Totenkopf is coming for him next. Suddenly, seemingly indestructible robots attack the city. Clearly outmatched, the authorities call for "Sky Captain" Joe Sullivan, the city's hero and Perkins' ex-lover and the commander of the private air force the Flying Legion.
While Joe engages the robots with his modified Curtiss P-40 pursuit fighter, Perkins photographs from the street with little regard for her personal safety. He eventually manages to disable one robot; the rest leave thereafter. News reports show similar attacks around the globe. The disabled robot is taken back to the Legion's air base so that technology expert Dex can examine it. Polly follows and convinces Joe to reluctantly let her in on the investigation. Her information takes them to the ransacked laboratory of a dying Dr. Jennings, while an assassin escapes. Just before he dies, Jennings gives Polly the two vials and states that they are crucial to Totenkopf's plans. Polly hides the vials and withholds the information from Joe. They return to the Legion's base just before it comes under attack from squadrons of ornithopter drones. Dex tracks the origin of the signal controlling the drones and notes it on a map before his capture.
Solution:
What is the first name of the person that Polly Perkins is looking into the disappearance of?