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: Medicine
Hyperparathyroidism causes : 
Select and explain. 
A. Ostetitis deformans, B. Osteogenesis imperfecta, C. Osteitis fibrosa cystica, D. Ameloblastoma
C: Osteitis fibrosa cystica
Answer: C: Osteitis fibrosa cystica 
Explanation: None