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: Arising form a moribund aviation company, in the 1970s, the new Canadair Challenger business jet on the drawing board was a risky proposition. Derived from a design by American inventor and aircraft developer Bill Lear, Canadair Chief Designer Harry Halton married a wide-body fuselage with a high performance ("supercritical") wing and state-of-the-art engines. With banks and the then federal Minister of Industry, Trade and Commerce Jean Chretien requiring 50 "firm orders", a Canadair sales team was dispatched to sell a "paper aircraft" with only sales brochures, scale models and a wooden mock-up to go on. The innovative Challenger design boasted industry-leading performance. It promised to be faster, cheaper to fly, and more comfortable than any other business jet.
With orders of 56 aircraft from North America, Europe and the Middle East, Canadair's top management, headed by Frederick Kearns, gave a "go" to the Challenger project. As the first prototype was completed, competitors touted their "off-the shelf" availability. Although months late, the Challenger was finally unveiled and prepared for its maiden flight, piloted by Canadair Chief Test Pilot Doug Adkins. After successful tests at the company plant in Montreal, the Challenger was flown to Mojave, California, to complete its arduous flight testing in order to obtain its certification for worldwide operation.
A:
Who added to the American inventor's design for the Challenger?