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
Mutation in GNAS 1 gene is associated with 
Select and explain. 
A. Fibrous dysplasia, B. Ossifying fibroma, C. Focal cementoosseous dysplasia, D. Periapical cementoosseous dysplasia
A: Fibrous dysplasia
Answer: A: Fibrous dysplasia 
Explanation: None