This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
Intrinsic factor of Castle is secreted by 
Select and explain. 
A. Chief bills, B. Parietal cells, C. Mucous cells, D. ss cells
B: Parietal cells
Answer: B: Parietal cells 
Explanation: Characteristics of the Gastric Secretions a. In addition to mucus-secreting cells that line the entire surface of the stomach, the stomach mucosa has two impoant types of tubular glands: oxyntic glands (also called gastric glands) and pyloric glands. b. The oxyntic or Parietal (acid-forming) glands secrete hydrochloric acid, pepsinogen, intrinsic factor. Ref: guyton and hall textbook of medical physiology 12 edition page number: 406,407,408