Generate a question with a factual answer.
Generated: Which animal was shown to have a negative effect on learning behavior due to nutritional deficiencies back in 1951?

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Generated: When Jews began to return to Frankish lands many took up occupations in which two fields?

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Generated: Until the mid 1900s most elevators lacked what?

Generate a question with a factual answer.
Generated: What sort of deposits does asphalt overlay?