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B
Polysaccharides
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C
Glycoproteins
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D
Phospholipids
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Solution
The correct option is B Glycoproteins The lubricant mucin of saliva is made up of glycoproteins. Mucin is a mucopolysaccharide or glycoprotein that is the chief constituent of mucus.
This lubrication helps in providing protection of body cavity linings.