Which bacteria is used to convert milk into curd?

Lactobacillus

The correct answer is Option (3) –Lactobacillus

Lactobacillus bacteria are commonly used in the fermentation process to convert milk into curd or yogurt. These bacteria ferment lactose, the primary sugar in milk, into lactic acid, which causes the milk to curdle and thicken, resulting in the formation of curd or yogurt. Lactobacillus is known for its probiotic properties and is also found in various other fermented foods and beverages.