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: Orthopaedics
Which of the following is a persistant biochemical marker of rickets - 
Select and explain. 
A. S.Ca++, B. S Alkaline phosphatase, C. S. Acid phosphate, D. S. phosphate
B: S Alkaline phosphatase
Answer: B: S Alkaline phosphatase 
Explanation: Serum alkaline phosphatase is a consistent marker and is raised in all types of rickets.