This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
A x ray film of skull is given, what is the diagnosis? 
Select and explain. 
A. Osteoblastoma, B. Osteoma, C. Sinusitis, D. Multiple myeloma
B: Osteoma
Answer: B: Osteoma 
Explanation: Multiple paranasal osteomas are found in Gardner's syndrome. Multiple osteoma of the mandible and maxilla, along with the frontal, sphenoid and ethmoid sinuses, rarely the long bones or phalanges. Cutaneous and soft tissue tumors. Association between colonic Polyps With a predilection to malignant degeneration. Ref :David Sutton 9th ed