The correct option is A α cells- glucagon, β cells- insulin, δ cells- somatostatin
Pancreas contain several hundred clusters of cells called islets of Langerhans. The islets are endocrine tissue containing four types of cells. They are the: beta cells, which secrete insulin; alpha cells, which secrete glucagon; delta cells, which secrete somatostatin, and gamma cells, which secrete pancreatic polypeptide.