This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Malabsorbtion Syndrome, Subject name: Medicine
Low serum cobalamin and elevated serum folate levels are seen in? 
Select and explain. 
A. Acute myeloid leukemia, B. Celiac sprue, C. Bacterial overgrowth syndrome, D. Chronic myeloid leukemia
C: Bacterial overgrowth syndrome
Answer: C: Bacterial overgrowth syndrome 
Explanation: Low serum cobalamin seen in Blood cancer but depletion of both Vit B12 and folic acid. So, leukemia Ruled out. Celiac Sprue - Involvement of Duodenum>Jejunum>Ileum Folic acid absorption- Jejunum Vit B12 absorption - T. Ileum So, Celiac spure ruled out Bacterial overgrowth syndrome Ileum involvement Vit B12 | Bacteria produce Folate products-Folic acid | IOC: Jejunal Aspirate culture Rx: Antibiotics