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: Anatomy
All of the following statements about the periosteum are true except? 
Select and explain. 
A. It is highly vascular, B. It does not cover the articular surface of the bones, C. It is pierced by the fibres of sharply, D. It is insensitive to pain
D: It is insensitive to pain
Answer: D: It is insensitive to pain 
Explanation: The periosteum is highly sensitive to pain. Note that the needle touching the periosteum in inadvertent intramuscular injection can produce severe pain.