This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CLL & CML, Subject name: Medicine
Vitamin B12 level in chronic myeloid leukemia is: 
Select and explain. 
A. Elevated, B. Decreased (slightly), C. Normal, D. Markedly decreased
A: Elevated
Answer: A: Elevated 
Explanation: Chronic Myelogenous leukaemia Increased levels of Vitamin B12 levels Uric acid levels Serum LDH levels Lysozyme Decreased levels of LAP( Leukocyte Alkaline Phosphatase )