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What is the source of “Whey”?

(a) Rice

(b) Wheat

(c) Soya

(d) Milk

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I would like to ask this question from Comparison of Batch and Continuous Culture in Industrial Processes topic in portion Microbial Growth Kinetics of Bioprocess Engineering

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The correct option is (d) Milk

Explanation: Whey is the liquid remaining after milk has been curdled and strained. It is a byproduct of the manufacture of cheese or casein and has several commercial uses. Sweet whey is a byproduct produced during the manufacture of rennet types of hard cheese, like Cheddar or Swiss cheese. Acid whey (also known as sour whey) is a byproduct produced during the making of acid types of dairy products, such as cottage cheese or strained yogurt.

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