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: In Mickey's Mellerdrammer, Mickey Mouse, Minnie Mouse, Goofy (known then as Dippy Dawg) and others present their own low budget light-hearted rendition of the 19th century Tom Shows for a crowd in a barn converted into a theater for the occasion.
Horace Horsecollar plays the white slave owner Simon Legree. Minnie plays the young white girl, Eva. Mickey plays old Uncle Tom with cotton around his ears and chin, and the young slave girl Topsy. Clarabelle Cow plays the slave woman Eliza. Goofy plays the production stage hand.
The cartoon opens with Mickey and Clarabelle Cow in their dressing rooms applying blackface makeup for their roles. The cartoon is much more focused on the Disney characters' efforts to put on the play, than an animated version of Uncle Tom's Cabin. The cartoon contains many images of Mickey and the other characters using makeshift props as sight gags.
The cartoon closes with the characters coming out for a bow, and Horace Horsecollar's character is pelted with rotten tomatoes. When Goofy shows his face from behind the stage, he is hit with a chocolate pie, leaving him in what appears to be blackface.
Output:
What is the first name of the character that plays Topsy?