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
GNAS-1 gene mutation is associated with 
Select and explain. 
A. Fibrous dysplasia, B. Osteogenesis imerfecta, C. Amelogenesis imperfect, D. Cleidocranial dysplasia
A: Fibrous dysplasia
Answer: A: Fibrous dysplasia 
Explanation: Fibrous dysplasia is caused by a mutation in GNAS1 gene.