Which acid is produced when milk gets sour?
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Tartaric acid
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Butyric acid
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Lactic acid
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Acetic acid
C
Correct answer
Explanation
When milk sours, lactic acid bacteria (like Lactobacillus) ferment the lactose sugar in milk into lactic acid, which gives sour milk its characteristic tangy taste and can cause curdling. This is the same process used in yogurt production.