Assertion: buttermilk's bacteria | /r/CapableOf | give its sour taste
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Source sentences:
text: Nowadays, as all milk and cream are pasteurized (which kills the naturally occurring bacteria), buttermilk is made by reintroducing Lactobacillus acidophilus, the probiotic bacteria that gives buttermilk its sour taste," said Dr. Vincent Pedre, author of the book "Happy Gut" and an internist in New York City.
text: The bacteria present ferment the milk sugars and give off the sour taste.