This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
[{'content': "Deficiency of the ' Intrinsic factor of Castle ' causes- \nSelect and explain. \nA. Megaloblastic anemia, B. Pernicious anemia, C. Cooley's anemia, D. Aplastic anemia", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pernicious anemia is a chronic disease resulting from deficiency of Intrinsic factor leading to impaired absorption of Vitamin B12. Megaloblastic anemia is due to deficiency of Cobalamin/folate. Reference: Atlas and text of Hematology, 3rd edition, pg:102. Exam preparatory manual for UGs by Ramdas Nayak page no: 259', 'role': 'assistant'}]