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
[{'content': "Vitamin B level in chronic myeloid leukemia is \nSelect and explain. \nA. Elevated', B. Decreased, C. Normal, D. Markedly", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Elevated CML there will be rise in B1, level LDH level And decreased levels of ALP.", 'role': 'assistant'}]