This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
[{'content': 'False statement regarding Schilling test is: \nSelect and explain. \nA. Unlabelled B12 is given IM, B. Labelled B12 given orally, C. Vit B12 excreted in urine, D. Abnormal test rules out primary intestinal malabsorption', 'role': 'user'}, {'content': "Answer: D \nExplanation: Schilling test - its test useful in diagnosis of etiology of vitamin B12 deficiency This test is divided into 2 main stages Stages Steps Result Stage 1 Oral radiolabeled vitamin B12 is given followed by unlabeled IM VITAMIN B12 A 24-hour urine collection monitors the absorption and the excretion Normal finding:-Excreting- 8 to 40% of radioactive vitamin B12 Abnormal:-any defect in absorption at terminal ileum Do Stage 2 Stage 2 Stage 1 is repeated along with an oral dose of intrinic factor 24 hour urine collection monitors the absorption and the excretion Normal urine excretion means Pernicious anemia If abnormal:- Fuher testing for cause cause:- crohn's disease Small bowel bacterial overgrowth syndrome Diphyllobothrium latum infection", 'role': 'assistant'}]