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
Alkaline phosphatase levels are elevated in all of the following except - 
Select and explain. 
A. Brain tumors, B. Obstructive jaundice, C. Bone tumors, D. Placental tumors
A: Brain tumors
Answer: A: Brain tumors 
Explanation: None