For this chain-of-thought reasoning and answer, what was the question?
When eggs are freshly laid, they are covered in a film called a 'bloom.'. Eggs with their bloom intact are able to stay at room temperature for one month. Pasteurization destroys the bloom on eggs. Pasteurization was introduced in the 1990's.
 A: no
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Q: Did eggs need to be kept cold in the middle ages?
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