This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Deficiency of the 'intrinsic factor of Castle' causes - 
Select and explain. 
A. Megaloblastic anemia, B. Pernicious anemia, C. Cooley's anemia, D. Aplastic anemia
B: Pernicious anemia
Answer: B: Pernicious anemia 
Explanation: None