Use reasoning to lead to the answer of the following question:
Did eggs need to be kept cold in the middle ages?

no
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.

.

So, the final answer is no