The film begins in Kansas, which is depicted in a sepia tone. Dorothy Gale lives with her dog Toto on the farm of her Aunt Em and Uncle Henry. Dorothy gets in trouble with a mean neighbor, Miss Almira Gulch, when Toto bites her. However, Dorothy's family and the farmhands are all too busy to pay attention to her. Miss Gulch arrives with permission from the sheriff to have Toto euthanized. She takes him away, but he escapes and returns to Dorothy, who then decides to run away from home, fearing that Gulch will return.They meet Professor Marvel, a phony but kindly fortune teller, who realizes Dorothy has run away and tricks her via his crystal ball into believing that Aunt Em is ill so that she must return home. She races home just as a powerful tornado strikes. Unable to get into her family's storm cellar, she seeks safety in her bedroom. A wind-blown window sash hits her in the head, knocking her out. She begins dreaming. The house is picked up and sent spinning in the air by the twister. Inside the storm outside the window, she awakens and sees an elderly lady in a chair, several farm animals, two men rowing a boat, and Miss Gulch (still pedaling her bicycle), who transforms into a cackling witch flying on a broomstick.Dorothy (Judy Garland, right) with Glinda the Good Witch of the North (Billie Burke)The farmhouse crashes in Munchkinland in the Land of Oz, where the film changes to Technicolor. Glinda the Good Witch of the North and the Munchkins welcome her as their heroine, as the house has landed on and killed the Wicked Witch of the East, leaving only her stocking feet exposed. The Wicked Witch of the West, arrives to claim her sister's ruby slippers, but Glinda transports them onto Dorothy's feet first. The Wicked Witch of the West swears revenge on Dorothy for her sister's death. Glinda tells Dorothy to follow the yellow brick road to the Emerald City, where the Wizard of Oz might be able to help her get back home.On her way, Dorothy meets and befriends the Scarecrow, who wants a brain, the Tin Woodman, who desires a heart, and the Cowardly Lion, who is in need of courage. Dorothy invites each of them to accompany her. After encountering the Witch, who attempts to stop them, they finally reach the Emerald City. Inside, after being initially rejected, they are permitted to see the Wizard (who appears as a large head surrounded by fire). He agrees to grant their wishes when they bring him the Witch of the West's broomstick.On their journey to the Witch's castle, the group passes through the Haunted Forest, while the Witch views their progress through a crystal ball. She sends her winged monkeys to ambush the four; they capture Dorothy and Toto. At the castle, the Witch receives a magical shock when she tries to get the slippers off Dorothy, then remembers that Dorothy must first be killed. Toto escapes and leads her friends to the castle. After ambushing three Winkie guards, they march inside wearing the stolen uniforms and free her, but the Witch and her guards chase them across the battlements and finally surround them. When the Witch sets fire to the Scarecrow, Dorothy puts out the flames with a bucket of water; the Witch is splashed and melts away. The guards rejoice that she is dead and give Dorothy the charred broomstick in gratitude.Ray Bolger, who plays the scarecrowRay Bolger in costume as the scarecrowBack at the Emerald City, the Wizard delays granting their requests. Then Toto pulls back a curtain and exposes the "Wizard" as a normal middle-aged man who has been projecting the fearsome image; he denies Dorothy's accusation that he is a bad man, but admits to being a humbug. He then gives the Scarecrow a diploma, the Lion a medal, and the Tin Man a ticking heart-shaped watch, granting their wishes and convincing them that they have received what they sought. He then prepares to launch his hot air balloon to take Dorothy home, but Toto chases a cat, Dorothy follows, and the balloon leaves without them. Glinda arrives and tells her that she can still return home by tapping her heels together three times and repeating, "There's no place like home". At the end of the film, Dorothy taps her heels together and awakens from her dream, surrounded by her family, the farmhands, Professor Marvel, and Toto., Question: Who exposes the "Wizard" behind a curtain?
Output: Answer: Toto