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': 'Schilling test is performed to find out \nSelect and explain. \nA. Folic acid Level, B. B12 malabsorption, C. Pancreatic enzyme deficiency, D. Coronary artery disease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]