Milk is spoiled $/$ fermented $/$ curdled by

Rhizobium

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Lactobacillus

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Azotobacter

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Clostridium

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Solution

The correct option is B Lactobacillus
Lactobacillus is a genus of gram-positive bacteria. It is widely used commercially in many dairy products. It converts the lactose present in the milk into lactic acid. Lactic acid creates casein and then forms a curd. This results in the curdling or spoiling of milk.
Thus, the correct answer is 'Lactobacillus.'

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