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
Enthesopathy is commonly found in - 
Select and explain. 
A. Rheumatoid arthritis, B. Rheumatic fever, C. Ankylosing spondylitis, D. Osteoarthritis
C: Ankylosing spondylitis
Answer: C: Ankylosing spondylitis 
Explanation: Enthesopathy

Enthesopathy is any abnormality of the site where the tendons and ligaments join the bone.
Abnormalities that can occur include inflammation (enthesitis) and calcification.
Important causes are:-


Ankylosing spondylitis      
Plantar fascitis
Other seronegative spondyloarthropaties  
 Golfer's elbow
Reiter's syndrome          
Postman's heel
Tennis elbow    
Iliotibial band syndrome