Question: When does boy in the striped pajamas take place?
Disambiguated questions and answers: question: During what period does the Boy in the Striped Pajamas take place?
During what years does the Boy in the Striped Pajamas take place?
answer: World War II
Holocaust
between 1939 and 1945
Natural Questions answer: World War II (from the Wikipedia article "The Boy in the Striped Pyjamas")