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.

Let me give you an 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.
The answer to this example can be: Who believes Fagin's gang make wallets and handkerchiefs?.
Here is 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.

OK. solve this:
Passage: In 1932, a luxury yacht is sailing through a channel off the western coast of South America. The captain is worried about the channel lights not matching the charts, but is quickly dissuaded from changing course by the wealthy passengers for the sake of time, including famous big game hunter and author Bob Rainsford. It is a calm evening, with the cheerful passengers relaxing over drinks and a game of cards. Bob and his companions are debating about whether hunting is at all sporting for the animal being hunted after a friend asks if he would exchange places with a tiger he had recently hunted in Africa. Bob replies that there are two kinds of people in the world: those who hunt and those who are hunted.
The ship suddenly runs aground, causing the ship to take on water and heave violently. Water floods the boiler room, causing the ship to explode and sink into the channel. Rainsford and two others manage to get away and cling to wreckage, but the other survivors are eaten by a shark. He swims to a small, lush island. Wandering through the jungle, he sees the channel lights off the shoreline change, and suspects the ship was deliberately led off course to its doom.
He stumbles across a luxury chateau where he becomes the guest of the expatriate Russian Count Zaroff, a fellow hunting enthusiast. Zaroff remarks that Rainsford's misfortune is not uncommon; in fact, four people from the previous sinking are still staying with him: Eve Trowbridge, her brother Martin, and two sailors.
That night, Zaroff introduces Rainsford to the Trowbridges and reveals his obsession with hunting. During one of his hunts, a Cape buffalo inflicted a head wound on him. He eventually became bored with the sport, to his great consternation, until he discovered "the most dangerous game" on his island. Rainsford asks if he means tigers, but Zaroff denies it.
Answer:
What is the last name of the person who becomes a guest at a luxury chateau?