question: Who was Frédéric a guest of during his stay in Berlin in 1829 ?
answer: Prince Antoni Radziwiłł
turker_answer: Frédéric was a guest of Prince Antoni Radziwiłł during his stay in Berlin in 1829 .
rule-based: Prince Antoni Radziwiłł was Frédéric a guest of during his stay in Berlin in 1829 .