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: Biochemistry
All of the following are characteristics of rickets except? 
Select and explain. 
A. Bow-legs, B. Delay in teeth formation, C. Decreased plasma level of calcitriol, D. Decreased alkaline phosphatase activity
D: Decreased alkaline phosphatase activity
Answer: D: Decreased alkaline phosphatase activity 
Explanation: Rickets in children is characterized by bone deformities due to incomplete mineralization, resulting in soft and pliable bones and delay in teeth formation. The weight bearing bones are bent to form bow-legs.
In rickets, the plasma level of calcitriol is decreased and alkaline phosphatase activity is elevated. Alkaline phosphatase is concerned with the process of bone formation.

Reference: Satyanarayana- Biochemistry, 3rd edition, pg-127