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: Medicine
The Schilling test is performed to determine the cause of - 
Select and explain. 
A. Lactose malabsorption, B. Fatty acid malabsorption, C. Amino acid malabsorption, D. Cobalamin malabsorption
D: Cobalamin malabsorption
Answer: D: Cobalamin malabsorption 
Explanation: None