Please answer this: What is the question to: "Throughout the Mary Poppins series, which lasted from 1934 to 1988, Mary Shepard was the illustrator and acted as a second author."? The topic is Mary Poppins.
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Answer: "When was the first Mary Poppins book written?"

Please answer this: What is the question to: "Charles Dillon "Casey" Stengel (; July 30, 1890 September 29, 1975), nicknamed "The Old Perfessor", was an American Major League Baseball outfielder and manager ."? The topic is Casey Stengel.
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Answer: "What is the name of the late Major League old professor?"

Please answer this: What is the question to: "The capture of Saigon by the Vietnam People's Army in April 1975 marked the end of the war, and North and South Vietnam were reunified the following year."? The topic is Vietnam War.
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Answer:
"how did the vietnam war end?"