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
Schilling test is performed to find out 
Select and explain. 
A. Folic acid Level, B. B12 malabsorption, C. Pancreatic enzyme deficiency, D. Coronary artery disease
B: B12 malabsorption
Answer: B: B12 malabsorption 
Explanation: None