Which of the following is both an exocrine and endocrine gland?

The source of somatostatin is the same as that of:

The hormone glucagon:

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.

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

In case the islets of $Langerhans$ stop functioning,which hormone will be in short supply and what will be its effect?