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
[{'content': 'Which one of the following definitions best fits the term enthesitis ? \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]