Task: Question Answering
Input (English): On a late evening, Allan Gray arrives at an inn close to the village of Courtempierre and he rents a room to sleep. Gray is awakened suddenly by an old man, who enters the room and leaves a square packet on Gray's table; "To be opened upon my death" is written on the wrapping paper. Gray takes the package and walks outside. Shadows guide him to an old castle, where he sees the shadows dancing and wandering on their own. Gray also sees an elderly woman and encounters another old man. Gray leaves the castle and walks to a manor. Looking through one of the windows, Gray sees the man who gave him the package earlier. The man is suddenly murdered by gunshot. Gray is let into the house by servants, who rush to the aid of the fallen man but it is too late to save him. The servants ask Gray to stay the night. GisÃ¨le, the youngest daughter of the Lord of the manor, takes Gray to the library and tells him that her sister, LÃ©one, is gravely ill. Just then they see LÃ©one walking outside. They follow her, and find her unconscious on the ground with fresh bite wounds. They have her carried inside. Gray remembers the parcel and opens it. Inside is a book about horrific demons called Vampyrs.By reading the book, Gray learns that LÃ©one is a victim of a Vampyr. Vampyrs can force humans into submission. The village doctor visits LÃ©one at the manor, and Gray recognizes him as the old man he saw in the castle. The doctor tells Gray that a blood transfusion is needed and Gray offers his blood to save LÃ©one. Exhausted from blood loss, Gray sleeps. He wakes sensing danger and rushes to LÃ©one, where he surprises the doctor as he is attempting to poison the girl. The doctor flees the manor, and Gray finds that GisÃ¨le is gone. Gray follows the doctor back to the castle, where Gray has a vision of himself being buried alive. After the vision subsides, he rescues GisÃ¨le but the doctor escapes. The old servant of the manor finds Gray's Vampyr book and discovers that a Vampyr can be defeated by driving an iron bar through its heart. The servant meets Allan Gray at Marguerite Chopin's grave behind the village Chapel. They open the grave and find the old woman perfectly preserved. They hammer a large metal bar through her heart, killing her. The village doctor is hiding in an old mill, but finds himself locked in a chamber where flour sacks are filled. The old servant arrives and activates the mill's machinery, filling the chamber with flour and suffocating the doctor. The curse of the Vampyr is lifted and LÃ©one recovers. GisÃ¨le and Gray cross a foggy river by boat and find themselves in a bright clearing.[7], Question: What can defeat a Vampyr when driven through its heart?
Output (English): Answer: Iron bar