Which component of saliva destroys harmful bacteria?

Match List-$I$ with List-$II$:

List-$I$ (Cells)	List-$II$ (Secretion)
$A$. Peptic cells	$I$. Mucus
$B$. Goblet cells	$II$. Bile juice
$C$. Oxyntic cells	$III$. Proenzyme pepsinogen
$D$. Hepatic cells	$IV$. $HCl$ and intrinsic factor for absorption of vitamin $B_{12}$

Choose the correct answer from the options given below:

Given below are two statements regarding gastric glands.
$Statement-I$: Oxyntic cells secrete pepsinogen.
$Statement-II$: Chief cells secrete $HCl$.
In light of the above statements,choose the appropriate answer from the options given below.

Match the following ducts in column $A$ with their respective organs or glands in column $B$:
$A$ (Duct) | $B$ (Organ/Gland)
$A.$ Stensen's duct | $1.$ Gall bladder
$B.$ Ducts of Rivinus | $2.$ Liver
$C.$ Duct of Wirsung | $3.$ Parotid gland
$D.$ Ductus choledochus | $4.$ Sublingual gland
$E.$ Wharton's duct | $5.$ Pancreas
$F.$ Cystic duct | $6.$ Common bile duct
$G.$ Hepatic duct | $7.$ Submaxillary gland
The correct matching sequence $(A, B, C, D, E, F, G)$ is:

The cells of the pancreas are not digested by their own enzymes because...

The toxic substances are detoxified in the human body by: