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
Increased serum acid phosphatase is a laboratory finding of: 
Select and explain. 
A. Osteopetrosis, B. Hyperparathyroidism, C. Fibrous dysplasia, D. Scurvy
A: Osteopetrosis
Answer: A: Osteopetrosis 
Explanation: None