Task: Question Generation
Input (English): When occultist uncle Dr. Plato Zorba wills a huge ramshackle house to his nephew Cyrus and his impoverished family, they are shocked to find the house is haunted. Their new furnished residence comes complete with Dr. Plato Zorba's housekeeper, Elaine Zacharides, plus a fortune in buried treasure and 12 horrifying ghosts.His family soon discovers that these spirits include a wailing lady, clutching hands, a floating head, a fiery skeleton, an Italian chef murdering his wife and her lover in the kitchen, a hanging lady, an executioner and severed head, a fully grown lion with its headless tamer, as well as Dr. Zorba himself, all held captive in the eerie house looking for an unlucky thirteenth ghost to free them. Dr. Zorba leaves a set of special goggles, the only way of seeing the ghosts.However, there is someone in the house who is also looking for the money and is willing to kill for it. The villain turns out to be the lawyer, Benjamin Rush. He attempts to kill Cyrus' son, Buck, using the falling bed canopy he used to kill Dr. Plato Zorba, but Dr. Zorba's ghost catches him in the act, driving the terrified Rush to his death in the bed just as Buck escapes. Rush becomes the 13th ghost, and the ghosts disappear. The next morning, Cyrus and his family count the discovered money, Buck keeps the mask used by Benjamen Rush to scare Buck's big sister Medea Zorba, and they decide to stay.
Output (English): Question: Who can free the ghosts?, Answer: The thirteenth ghost