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: Pathology
Features of Paget’s disease can be: 
Select and explain. 
A. Affecting the skull generally leads to a progressive increase in circumference of the head. (osteoporosis circumscripta), B. Jigsaw puzzle appearance of the bone, C. Leontiasis ossea., D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: None