Gastric juice of infants contains

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:

Which of the following salivary glands is the largest?

Which of the following is the constituent of pancreatic juices?

Kupffer's cells are:

Which of the following is a unicellular gland found in the wall of the gut?