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': 'Alkaline phosphatase levels are elevated in all of the following except - \nSelect and explain. \nA. Brain tumors, B. Obstructive jaundice, C. Bone tumors, D. Placental tumors', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]