The question is taken from the story 'Lamb to the Slaughter'. The overall tone of Patrick with Mary in the story of 'Lamb to the Slaughter', is of tranquility.
The story Lamb to the Slaughter is written by Roald Dahl, which is played by the main characters, Patrick (husband) and Mary (wife), who leave each other and get separated, and later Mary kills Patrick.
Hence, the significance of Lamb of the Slaughter is aforementioned.
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