Question: Was Sainsbury's the largest supermarket in the UK during World War II?, Answer:Yes, Description of Sainsbury's: chain of supermarkets in the United Kingdom, Fact1: Sainsbury's became the largest supermarket in the UK in 1922. , Fact2: World War II started in 1939.
Step1: When did Sainsbury's become the largest supermarket in the UK?, Step2: When did WW II begin?, Step3: Is #2 after #1?, Wikipedia page for step 1: Sainsbury's, Wikipedia page for step 2: World War II, Wikipedia page for step 3: , not_definitive_answer: False, incorrect_answer: False