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': 'The Schilling test is used for detecting: \nSelect and explain. \nA. Presence of intrinsic factor, B. Deficiency of riboflavin, C. Excretion of folic acid, D. Capillary fragility', 'role': 'user'}, {'content': 'Answer: A \nExplanation: SCHILLING TEST (24-HOUR URINARY EXCRETION TEST):\xa0\n\nSchilling test is done to detect vitamin B12 deficiency as well as to distinguish and detect lack of intrinsic factor and malabsorption syndrome.\xa0\nThe results of test also depend upon good renal function and proper urinary collection.\nRadioisotope used for labeling B12 is either 58Co or 57Co.\n\n\u200bMohan H. Textbook of pathology. Jaypee Brothers Medical Publishers; 2015. Edition 7. Page 284', 'role': 'assistant'}]