Which part of the body secretes the hormone secretin?

Identify the type of gastrointestinal hormone based on the functions given below:
$I.$ Stimulates the crypts of Lieberkuhn
$II.$ Inhibits the secretion of glucagon by alpha cells
$III.$ Stimulates Brunner's glands to release mucus
Choose the correct option accordingly.

Trypsin is related with the digestion of:

The enzyme which coagulates milk is called:

The enzyme that hydrolyses casein of milk into paracasein is:

Which of the following is not produced by the brush border cells of the intestinal mucosa?