60 year old male with bony abnormality at upper tibia associated with sensori neural hearing loss.On laboratory examination serum alkaline phosphatase level are (440 mU/l) elevated and serum Ca+and PO4 are normal.Skelatal survey shows ivory vertebrae and cotton wool spots in X-ray skull.Diagnosis is -

60 year old male with bony abnormality at upper tibia associated with

1.	60 year old male with bony abnormality at upper tibia associated with sensori neural hearing loss.On laboratory examination serum alkaline phosphatase level are (440 mU/l) elevated and serum Ca+and PO4 are normal.Skelatal survey shows ivory vertebrae and cotton wool spots in X-ray skull.Diagnosis is -
A.	Paget disease
B.	Fibrous dysplasia
C.	Osteoporosis
D.	Osteosclerotic metastasis
Answer» B. Fibrous dysplasia