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
Apert syndrome is a disease of: 
Select and explain. 
A. Blood, B. Bones and joints., C. Skin, D. Autoimmune disorder.
B: Bones and joints.
Answer: B: Bones and joints. 
Explanation: None