Prostaglandins affect

Identify the wrong statements:
$A.$ Erythropoietin is produced by juxtaglomerular cells of the kidney.
$B.$ Leydig cells produce Androgens.
$C.$ Atrial Natriuretic factor,a peptide hormone,is secreted by the seminiferous tubules of the testes.
$D.$ Cholecystokinin is produced by the gastro-intestinal tract.
$E.$ Gastrin acts on the gastric glands and stimulates the secretion of hydrochloric acid and pepsinogen.
Choose the most appropriate answer from the options given below:

Erythropoietin is secreted from

Gastrin is a hormone secreted by the gastrointestinal $(GI)$ tract, which stimulates the secretion of:

Which part of the body secretes the hormone secretin?

Which of the following is a gastrointestinal hormone?