Given the task definition, example input & output, solve the new input case.
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: 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.
Output: Who believes Fagin's gang make wallets and handkerchiefs?.
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 case for you: Passage: Four days after the events of the first film, former assassin John Wick retrieves his stolen 1969 Ford Mustang Mach 1 from a chop shop owned by Abram Tarasov, brother of Viggo and uncle of Iosef. John dispatches Tarasov's men in a violent rampage that heavily damages the Mustang, but spares Tarasov under the auspices of peace and returns home, cementing his weapons into the ground once again.
After car shop owner Aurelio takes John's Mustang for repairs, John is visited by Italian crime lord Santino D'Antonio. It is revealed that to complete his "impossible task"—which allowed him to retire and marry Helen—John asked Santino for help. As a form of contract, Santino swore John to a "marker", an unbreakable promise symbolized by a "blood oath" medallion. Santino presents the medallion to demand services from John, who declines, claiming that he is retired. In retaliation, Santino destroys John's home with a grenade launcher.
John travels to The Continental Hotel in New York City. Winston, the owner of the hotel, reminds John that if he rejects the marker, he will be violating one of the two unbreakable rules of the underworld: no blood on Continental grounds, and every marker must be honored. John reluctantly accepts his commitment and meets with Santino, who tasks him with assassinating his sister Gianna so he can claim her seat on the "High Table", a council of high-level crime lords. Santino sends Ares, his mute personal bodyguard, to surveil John.
Output:
What is the full name of the character who wants his sister assassinated?