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B
Helps you to smell food.
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C
Helps you to talk.
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D
Helps you to hear.
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Solution
The correct option is A Helps you to digest food. Saliva is a watery secretion in the mouth produced by the salivary glands that aids in the digestion and swallowing of food. Saliva also serves in moistening and tasting the food. It also kills the germs that are present in the food.