Correct option is A
A lactometer is an instrument that is used to check for the purity of milk by measuring its density. An instrument to find out the content of water in milk or to test the richness of milk is thus termed a "lactometer."
A lactometer is an instrument that is used to check for the purity of milk by measuring its density. An instrument to find out the content of water in milk or to test the richness of milk is thus termed a "lactometer."
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