"Islets of Langerhans" are found in

Which of the following pairs is incorrect?

Which gland functions as both an endocrine and an exocrine gland?

The pancreas produces $..........$ enzymes and $...........$ hormones.

Patients with diabetes mellitus are successfully treated by:

Match different cells of Islets of Langerhans in Column-$I$ with their role in Column-$II$. Select the correct answer from the options given below.

Column-$I$	Column-$II$
$A$. Alpha cells	$I$. Stimulates muscles for glycogenesis.
$B$. Beta cells	$II$. Decreases gastric secretions and absorption in digestive tract.
$C$. Delta cells	$III$. Inhibits the release of pancreatic juice.
$D$. $F$ cells	$IV$. Stimulates liver for glycogenolysis.