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 one of the following definitions best fits the term enthesitis ? 
Select and explain. 
A. Inflammation at the site of tendinous or ligamentous insertion into bone, B. Inflammation of the periarticular membrane lining the joint capsule, C. Inflammation of a sac-like cavity near a joint that decreases friction, D. All of the above
A: Inflammation at the site of tendinous or ligamentous insertion into bone
Answer: A: Inflammation at the site of tendinous or ligamentous insertion into bone 
Explanation: None