Answer the following question: Generate a question that has the following answer: Agnes for the following movie plot: In 1899, Joseph Kolaizcek, the grandfather of Oskar Matzerath, the main character, is being pursued by the police through rural Kashubia. He hides underneath the skirts of a young woman named Anna Bronski, with whom he later has a daughter Oskar's mother. He evades the authorities for a year, but when they find him again, he either drowns or escapes to America and becomes a millionaire. Anna's daughter Agnes has two lovers: her cousin Jan Bronski, a Polish Post Office worker, and Alfred Matzerath, whom she marries. The two men are great friends. Agnes gives birth to a son, Oskar. Oskar's father is uncertain; Oskar himself believes he is Jan's son. On Oskar's third birthday, he is given a tin drum. He decides to stop growing and throws himself down the cellar stairs. From that day on, he does not grow at all. Oskar discovers that he can shatter glass with his voice, an ability he often uses whenever he is upset. Oskar's drumming also causes the members of a Nazi rally to start dancing. During a visit to the circus, Oskar meets Bebra, a performing dwarf to whom he can relate. When Alfred, Agnes, Jan and Oskar are on an outing to the beach, they see an eel-picker collecting eels from a horse's head used as bait. The sight makes Agnes vomit repeatedly. Alfred buys some of the eels and prepares them for dinner that night. When he insists that Agnes eat them, she becomes distraught and retreats to the bedroom. Jan enters and comforts her, all within earshot of Oskar who is hiding in the closet. She calmly returns to the dinner table and eats the eels. Over the next few days, she binges on fish. Anna Bronski helps reveal that Agnes is worried her pregnancy is due to her relations with Jan. In anger, Agnes vows that the child will never be born. She dies, though the cause is never revealed. At the funeral, Oskar encounters Sigismund Markus, the kindly Jewish toy seller who supplies him with replacement drums, and who was also in love with Agnes. Markus is ordered by two of the mourners to leave because he is...
Answer:
Who is Oscar's mother?