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
[{'content': 'Pernicious anemia occur due to \nSelect and explain. \nA. Failure of secretion of Vit B12, B. Failure of secretion of intrinsic factor, C. Failure of absorption of intrinsic factor, D. Folate deficiency', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]