(B) Saliva contains the enzyme $ptyalin$,also known as $salivary \ amylase$.This enzyme is responsible for the digestion of starch into maltose.$Ptyal

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(B) Saliva contains the enzyme $ptyalin$,also known as $salivary \ amylase$.This enzyme is responsible for the digestion of starch into maltose.$Ptyalin$ functions optimally at a $pH$ range of approximately $6.7$ to $6.8$,which is considered a nearly neutral medium.Therefore,the correct option is $B$.