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: On the day of Prince Dolor's baptism, there was a great procession. His well-to-do nurse was fiddling with her dress while holding the Prince and she dropped him and broke his legs. But she told no one.  A fairy godmother appears to the Nurse and reveals she knows what happened. The Prince's Mother (the Queen) dies.  The Prince's legs never grow strong.  He cannot walk; he can only crawl with his arms.  The King dies too.  The Regent family moves into the castle (with lots of kids) and the Prince's Uncle rules the kingdom.  Things are good throughout the land, but Prince Dolor is ignored.  The new King sends Dolor away and tells everyone that Dolor died.
Dolor is sent away to live in the lonely tower in the middle of a wasteland.  There are no doors in the tower.  It is 100 ft tall.  But he has lots of books and toys and maps. His only companion is his nurse.  And a deaf mute Black Knight brings them food and things.  The Nurse is a 'prisoner' too.  They use a ladder to get up into the tower.  The Black Knight visits once a month.  The Prince likes to be quiet and look out the window at the lonely plains.  He does his lessons and schoolwork.  He loves books.  He learns of the kingdom of Nomansland.  But he feels that to read of things and never see them is sad.  If only he could FLY he wished.  And he wishes he had someone who would be nice to him.  He was lonely.
An old grey woman appears.  She says I am your fairy godmother.  Dolor asks, "Will you bring me a boy to play with?" She says no.  But gives him a gift: A travelling cloak.  When the nurse comes into the room to see who he was talking to, she disappears.  The cloak looks like a poncho.  He didn't know the magic powers it holds.
Output:
Who disappeared when the nurse came into the room?